Virus usually hides itself from the user and for that it marks itself as system file. And usually in our pc the system files are kept hidden for safety.Here is the trick to see those hidden virus files.
To see this hidden system files go to tools>>Folder Options>>
Select ‘View’
Check ‘Show hidden files and folders’
Uncheck ‘Hide protected operating system files’
Another method:
Go to Start->run->cmd
Then navigate to desired directory.
Then Type
attrib foldername /s /d -s -h -r
+R :- Use the +R option to make a file read-only. Read-only files may be read but they can`t be changed or deleted.-R : – Use the -R option to change the file protection attribute back to normal (so it can be read, changed, or deleted).
+A :- Use the +A option to set the ARCHIVE attribute of a file. When the +A option is used, this flags the file as available for archiving when using the BACKUP or XCOPY commands.
-A :- Use the -A option to turn off the ARCHIVE attribute.
+H : – With DOS Versions 4 through 6, use the +H option to set the HIDDEN attribute of a file so that it will not appear in a directory listing.
-H :- Use the -H option to turn off the HIDDEN attribute.
+S :- With DOS Versions after Version 4, use the +S option to set the SYSTEM attribute of a file. When the +S option is used, this flags the file as a command file used only by DOS. The file will not appear in a directory listing. This attribute is generally reserved for programmers.
-S :- Use the -S option to turn off the SYSTEM attribute.

User must know how to differentiate between virus files and system files or you may end up corrupting your os. So do this at your own risk.
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[...] Or you may have to change the attributes of this folder.For that you can refer this guide [...]
I’v windows XP in my computer. It is not disabling HIDE PROTECTED OPERATING SYSTEM FILES. Kindly give me the solution
See this posts
http://etricks.in/2008/08/folder-option-not-working-see-this.html
http://etricks.in/2008/09/double-click-on-drive-shows-open-with.html
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