One of the latest virus doing the round is the one that give you an error message
Clicking on ‘Yes’ will as you to download another malware , ‘No’ will redirect to you a page http://free-viruscan.com/id/4912933/4/1/ that fakes a system scan and further ask you to download a fix.
This virus is not a memory-resident programs or a startup services but a BHO ( Browser Help Object) . Hence the reason for being triggered whenever the windows explorer is used.
If you get an error message as below on running
Error: Variable must be of type “Object1″
Download and install ‘Windows Scripts 5.7″ for windows xp and “windows Scripts 5.6” for windows 2000
and rerun the FixIEDef.exe . That should get rid of the virus.