Tag Archives: Computer

What Is A Computer Virus And What Does It Do?

A computer virus is basically a program which enters and gets installed on your computer and which can simultaneously execute or run on its own when a specific type of file is clicked. A virus can enter a computer either when you receive an email or you transfer a file, which is infected from one computer to the other.

The effect of a virus can be fatal to the machine to the extent that it gets damaged, files can be deleted, corrupted, boot sector over–ridden and hard drives could stand formatted. A virus would be generally a program which either executes on its own or asks for execution such as an exe, SYS, OVL, OBJ, PRG, MNU and BAT files.

Generally a virus would be attached along with legitimate program and would execute as soon as a genuine program is executed. This is done so that the user is not aware about the virus getting executed and in the meantime the virus would have done its part.

Many times a virus changes its code on its own when it moves from one computer to other. This is done so that user is not able to make the virus ineffective.

In India generally W32/Coronex-A viruses are found which will affect the address book and start phishing mails or fraudulent mails and fool other users.

Various types of Computer Viruses are:

1. Resident virus: These are the viruses which reside in your PC’s RAM. These viruses end up corrupting various programs that are installed and running on your machine.

2. Boot Virus: These viruses reside on the boot sector of your hard drive and thus it affects the operating system.

3. File Virus: These affect the .exe files to which they get attached.

4. Multipartite Virus: These viruses are a combination of Boot and File Virus. These viruses cause maximum infection to the machine since they affect both the boot sector of the hard drive as well as the files stored on the PC.

5. Network Virus: This is the virus which spreads through LAN and via Internet.

6. E-mail Virus: This virus gets attached to all the contacts in your Email list and it spreads once the mail is opened and viewed.

7. Macro Virus: All programs like MS Office that use macros get infected by this virus. These viruses are operating system independent meaning they can affect any system irrespective of the operating system it uses.

There are various anti-viruses and firewalls that have come up to counter affect these viruses and stop them from attacking your PC. Some of the common and most widely used are BitDefender, Norton, F-Secure, ESET NOD32, Kaspersky, TrendMicro, Panda, AVG, McAfee, ZoneAlarm and GData. The best way to protect your PC is to use a good anti-virus program that is updated regularly and simultaneously use a good firewall too.

How To Improve Computer Performance ?

improve-computer-performanceComputers often freeze or crash when one needs them the most, in the middle of an important presentation, a term paper that’s due the next day, or while updating our financial software. Many computer problems can be solved with free or low-cost products or just by using a few common sense tips to improve performance and keep your PC running for a long time.

1. Virus Scan Program

The most essential thing to have is a virus scan that is run weekly. Most new computers come with a virus scan already installed. If the computer you are using doesn’t have a virus scan there are free scans available online, but one really should be installed on your computer if you spend any time at all online. Spend the time learning how to use your virus scanner. Find out how it’s updated – most update automatically – and use the options to set it up to run automatically at a set time every week. Most computer problems can be prevented just by having a virus scanner installed.

2. Run the Scandisk program

At least every two months you should run a program called Scandisk. It is automatically on your computer. Scandisk actually scans your files and even your hard drive and can let you know of any problems it discovers.

To run Scandisk, first make sure everything running in the background on your PC is turned off. To do this press “Ctrl-Alt-Delete” and your close program box will appear.

Highlight each item EXCEPT “explorer” and “systray”. Click on “End Task” to close the program.

Then go to your start button and choose “Programs”. Choose “Accessories” at the top of the list. Move your cursor down to “System Tools” and Choose “Scandisk”.

A box will appear giving your choices of what you want your computer to scan. You can have it scan your files only or your entire hard drive. Scanning your hard drive will take longer.

3. Run the Defragmenter program

Another program that you should run about every two months is called Disk Defragmenter. Defrag will arrange your files better so your PC can access them faster. It’s best to run this program after the Scandisk program is finished.

To run Disk Defragmenter go back to the “System Tools” and choose “Disk Defragmenter”. It’s best to run this program overnight as it takes a long time.

You should not be using these programs while using other programs on your computer. If the Scandisk or Defrag program keeps starting over you may need to run the programs in Safe Mode, a special diagnostic mode. Read the manual for your PC to find out how to put your PC into Safe Mode.

4. Use a Firewall program

For anyone on a DSL or cable connection a personal firewall keeps viruses, hijackers and hackers from your computer. Since you are constantly connected to the internet by using these connections there is a constant threat that others may try to access your computer. There are free firewall programs available for download.

5. Run a Spyware program

Anyother important program is a spyware search program. When you download something from the internet sometimes other software is included. This software is called “spyware” and it can do many things to harm your computer, including letting someone from another website see what websites you surf in order to send you advertising. Other spyware tries to steal your passwords or other personal information. You should run a spyware checker at least once a month or at any time you are experiencing problems with your connection or computer speed.

6. Run a hi-jacker search program

Another important program to have is a hi-jacker search program. A hi-jacker changes your homepage to a different search engine page and can also block links to common search pages. They are trying to force you to use their homepage. Some of the hi-jacker’s homepages are not pages you would like your children to see. You should use a hi-jacker search program at least once a month or whenever you are having a problem with your homepage.

7. Clear your temporary files

Sometimes your PC’s virtual memory will become full. When this happens your computer may run slow, give you error messages or freeze during a program. This happens because everything you do on your PC – every picture on every webpage, every document you type, every photo you change – is saved somewhere on your PC, even after you have left that page and closed the document. In order to erase this memory you need to do the following steps:

Open your internet browser. Go to “Tools”, “Internet Options”.

A box will pop open. It should be open to the “General” tab.

In the center of the box is a section marked “Temporary Internet Files”.

Click on “Delete Cookies” and “Delete Files” one at a time. This will delete the temporary files that are clogging the PC’s memory.

8. Change your history options

Another way to clean out your computer’s memory is to change how many days it saves visited pages. You will find a “history” box in your internet options. It asks how many days you wish to keep pages in history. This is the part of the computer that saves all pages you’ve visited for as many days as you wish. By saving these pages for a smaller number of days you can clear up more of your PC’s memory.

9. Clean out old files

Periodically going through the files in My Documents or other folders you have set up and deleting or archiving them on a CD can also help your computer’s memory and performance. Do you really need to keep a saved copy of last semester’s English term paper? If not, delete it. You can also go through the programs on your PC from the control panel and delete those you no longer use. Don’t delete any of the shared files, though, if it asks, because that can cause more problems.

10. Reboot the PC occasionally

The last thing that is very important to do but seems simple is just to turn your computer off periodically. Your PC needs to be restarted in order to reset itself after new programs or equipment is installed. It also erases the virtual memory from the last session and goes through a self-diagnostic to look for any problems. It sounds like a simple solution, but most problems can be fixed simply by restarting your PC.

Troubleshooting your PC’s problems doesn’t have to cost a lot of money or require technical expertise. By using just a few software programs and common sense most problems can be stopped and you will find that your PC has better performance and reliability.

How To Clean A Computer ?

If your family is like mine, your inventory of home-based electronic devices is growing. This acceleration requires regular cleaning, especially your PC. Only three decades ago, computers were medium-sized tractor trailer samples. Trained engineers protected the delicate hardware in dust-free, environmentally controlled rooms. Contemporary personal computers, some as small as three-ring binders, sit on our kitchen counters, desks and bedroom family card tables. Family members, including pets, touch keys and drag the mouse around. The computer collects dust, cracker crumbs, and Popsicle drips. Over time, accumulated dirt problems.

You can change the maintenance and cleaning problems in setting up your PC in a friendly place. To protect your PC, keep it in a corner protected from direct sunlight and long periods of fresh air. Place it on a solid surface with good air flow behind the back of the CPU.

You need a few household supplies: q-tips, soft cloth and detergent. The only specialist materials you need are canned air and inexpensive kits for cleaning the drive heads. PC cleaned not long and not worry, you will not damage anything following these instructions. Most PCs have several parts so that they one by one. Before you begin, turn off the power to your computer.

computer-cleaningHow to clean computer screen/monitor ?

The monitor, like your television screen attracts dust and sticky fingerprints. You can take the anti-static wipes that double as screen cleaners. If you have a shock when you touch the screen, static is a problem on your workstation. Consider placing a plastic mat under the seat to reduce static build-up. I have noticed that the paper towels work as screen cleaners. Avoid spraying liquid at your monitor. Moisten the cloth and wipe the screen once a week.

Keyboard Cleaning

Regular cleaning keeps your keyboard looking new. Use a soft cloth, such as a cotton diaper, moistened with a mild soap solution to wipe out the keys. While you perform the cloth on the plastic casing around the monitor and CPU. Sure to lift the keyboard and substance under the surface. Turn the keyboard upside down to shake out crumbs or use a damp q-tip to remove them.

Avoid allowing water to seep between keys. Keyboards do not like to get soaked. Accidents can happen and I can personally guarantee that if you spill a glass of water on your keyboard, all is not lost. Set the keyboard upside down on a towel. Let it dry overnight and it must be good. If the keyboard does not respond well after an incident off time, call a professional.

Mouse Cleaning

The mouse cursor on the screen as you slide the pointing device on a padded surface. When you notice that the mouse cursor does not respond quickly, it’s time for a cleaning. Most mice have a small cover that protects the ball hidden in the cabinet. Remove the cover by rotating, shaking the cracker crumbs, and wipe the ball clean. You must also blow into the ball cage or spray cans feed air into the opening. Replace the ball and set the mouse. Clean the mouse about once a month, especially if your kids are like mine and eat near the PC.

External Drives Cleaning

Your computer, especially older models, may also be external drives. Floppy, tape, and CD-ROM drives all gathering dust. The read-write head in each station scans the hard disk or tape as it reads and writes data. A dusty head can scratch the disc or tape and cause maintenance problems. Regular cleaning is a must.

Several commercially available products can help you clean drive heads. These cheap products, generally less than $ 10.00, you need to insert in the drive, a disk or cartridge moistened with cleaning fluid. Follow the instructions of the manufacturer to change the read / write head access to scan the surface. If you are lucky a drive with a yellow caution light you know that it is time to clean when the light comes. Otherwise try to clean your drives once a Monday

Central Processing Unit-CPU

The CPU is in the metal case containing the computer parts you do not see. The motherboard, modem, network cards and live in slots at the bottom of the metal box. A high-speed fan inside the box prevents overheating and shuttles data around, after the commands. Help the fan does its job and minimize dust accumulation by ensuring that clear air space behind your CPU.

One or two times per year, or when you upgrade the memory, remove the screws from the back of the CPU and slide the lid of the box. Tape the screws to the cover, while you work. The screws are small and easy to misplace. Target a look of compressed air to an open area and spray the dust from the components. You will not hurt your computer to do so. When you’re done, slide the cover back on. It may be a tight fit. Especially for the screws back into place.

Your computer is now clean. The cost of PCs is significantly decreased in the last ten years, but the chances are that you are looking at the same monitor, keyboard and housing for a while. Spend a few minutes the care of your computer every week. You will be pleased with the results and save money!