Winstall.exe - helpp!, pc help Options

[durnayasar]

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??
Lots of thanks