What is it?

winstall.exe is associated with a trojan horse downloader and several internet worms.

What does it do?

The worm that dropped winstall.exe on your drive also added reg settings to ensure that winstall.exe ran at windows startup.

Winstall.exe adds a popup to your desktop exclaiming that your computer is infected while offering purchasable software to remove the infection.

Do not buy into this! go to www.trendmicro.com and run "housecall free online scan" Also review their recommendations for removing the related "Grayware" infection.

More info:

Check out this google search for more info about winstall.exe

See what trend micro has to say about winstall.exe