It's supposed to go away from an uninstall:
Click Start -> Control Panel -> Add/Remove Programs
Scroll to Wind Updates and click Remove
If not use HijackThis, (
www.tomcoyote,com/hjt) boot into
Safe Mode (F8) without networking, Scan only and check
O4 - HKLM\..\Run: [Preview AdService] C:\Program
Files\Preview AdService\PrevAdServ.exe
and press Fix Checked. Then remove the Preview AdService
folder in C:\Program Files\.
Finally run AntiSpy and have it do a full scan (with all
three options checked) while still in Safe Mode.
If it comes back when you reboot it may be reinstalled by
some other program. Use msconfig
(
www.netsquirrel.com/msconfig) to stop programs from
loading until you find it.
Ron