Try one of these trojan removers. There are free 30 day trials on either of them.
The Cleaner Pro 30 days trial - http://www.moosoft.com
TrojanHunter - http://www.misec.net/ (trial)
Also do an online scan at one or all of these.
Housecall (using IE with Active-X)
Housecall (all browsers using java)
im using ZoneAlarm and it found a Win32.startpage.IZ in some archive files, it gives some explanation of how to repair them, but i cant find the files and it cant repair them by itself. What should i do?