Winstall.exe - helpp!!

Hi
My computer was infected with a trojan virus today, from a link from someone on msn messenger. I ran AVG Free and the virus went to the vault, which i have deleted and all seems to be running fine now. however, i've had to vault it three times. when I restart, the virus seems to reappear. but my computer is running fine.

but...

there is an icon on my desktop titled winstall.exe which when scanned doesn't contain a virus, but I have just had a quick scan thru some stuff on the internet and get the idea that its a nasty little program that lets other nasty stuff infect my computer I can't delete it, and in fact, am not sure if this is accurate and am a little worried its an important windows file i shouldnt be deleting at all.

I've now installed Avira Antivir as well, as a double up safety precaution, but no spyware detection programs as yet (I'm not even sure if I'm wording that correctly..)

help??
Thank you

Hello alisaselez. Welcome here.

But, uhm like... This is a Mac forum?...

Did you get this running Boot Camp on the Windows side?

And this is certainly not the forum to post this either. This is a rumours sub-forum.

This creatures can create a copy of themselves everytime you restart your PC, so unless you clean the source it is pointless. AV software from the Internet can be dangerous too, they can give you false information so you buy their products, go for a standard AV like Norton Antivirus. Anyway, this links can help you...

http://www.pcreview.co.uk/startup/winstall.exe.php
http://www.symantec.com/security_response/writeup.jsp?docid=2006-041209-2932-99&tabid=1

Two final advices, allways post your question in the rigth section, it will get an answer faster and our Moderators won't have to move it, and of course, forget Windows and get a Mac

You made the exact same first post on Zune Scene?
http://www.zunescene.com/forums/index.php?topic=5338.0

Why not try a site that actually specializes in PC Hardware/Software?