Maybe you get a dialog box "I DNT HATE MOZILLA BUT USE IE OR ELSE" when you try to open Mozilla Firefox. This is done by a virus called W32.USBWorm which is transmitted through USB drives.
This virus also responsible to deny access to YouTube - "youtube IS BANNED" and orkut - orkut IS BANNED.
W32.USBWorm does not harm your system files, it just restrict access to firefox and you cannot also Uninstall it.
I ran AVG free and AVG Spyware to detect it but could not detect it.
Here are the manual steps:
1.Go to Task Manager by pressing Ctrl+Alt+Del
2.On Process Tab delete Delete only the svchost.exe of your user name
3.Type c:\heap41a in you address bar of your explorer.
4.Right click on svchost icon and goto properties.
4.Remove the tick on "read-only" from the general tab and press OK.
5.Now Delete all files in that heap41a.
Best way to stay safe is to remove autoplay from the USB drive, you can find lot of articles how to remove autoplay from you computer in the net.
good explanation.. but similar detailed explanation with other possibilities are listed in http://simba.in/ read out.
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