This post helps a lot to those pupil who don't want any virus in there computer.

You should do following thing to protect your system from VIRUSES-

1. HAve an updated antivirus program i recommend Quick Heal plus 2008 because it actually repairs the file in 90% cases.

2. If u recieve an email attachment from an unknown source delete it

3. If u recieve an email attachment from one of your freind, first confirm from it and before opening read the complete file name of the attachment. Viruses most probably have the extension like these

"school girl.avi.vbs", "hot.jpeg.bat"  etc always look at the last extension.

4. When you want to use a pen drive or any usb drive, CD/DVD Drive then as soon as you connect the drive presss SHIFT key it disables AUTORUN. Now scan it from ur antivirus program. If u r not satisfied then do the following

open cmd

type the drive letter of ur usb drive say H: and press enter

now look for the Autorun file if any using DIR command

If there exist AUTORUN file then type AUTORUN.INF and press enter

the autorun file is now opened in notepad

  Sample Autorun File

[autorun]
open=foo.exe bar
;ShellExecute=index.html
icon=foobar.ico
action=Foo Bar
shell=doubleclick.exe
shell\configure=&Configure...
shell\configure\command=setup.exe
shell\install=&Install...
shell\install\command=setup.exe
Shell\Option1=Text1
Shell\Option1\Command=option1.exe
Shell\Option2=Text2
Shell\Option2\Command=option2.bat
label=My backup data

Observe which program is executing automatically as in the above example

Foo.exe, setup.exe, option1.exe, option2.exe are executing automatically

so to delete them go to cmd prompt

type the drive letter say h:

and then type

attrib autorun.inf -s -a -h -r

del autorun.inf

attrib foo.exe -s -a -h -r

del foo.exe

attrib setup.exe -s -a -h -r

del setup.exe.exe

attrib option1.exe -s -a -h -r

del option1.exe

attrib option2.exe -s -a -h -r

del option2.exe

Now u r safe to open your drive.

Here is another way to customize the autorun option

5. If you have created setting in your email to view the emails without opening it that is on clicking one of the email its preview is enabled then also 

disable it, because it also harms ur computer.