How do i findout what in my computer keeps changing my homepage to gophersearch.com. norton says no

norton, spybot, %26 adware all say i have no viruses, or spys but when i open internet explorer i get my regular page and on top of it gophersearch opens a different site and they very. when i check internet options it lists gophersearch.com as the home page. also sometimes when i go to open another page a screen pops up saying i can't enter a contest because my computer is not in the US when it is but i was not trying to enter any contest. please someone help me this is driving me nuts.

How do i findout what in my computer keeps changing my homepage to gophersearch.com. norton says no viruses?norton 2008

First of all: STOP using Internet Explorer(IE). Go for Firefox or Opera which r much more secure compared to IE. Don't Format the whole system, rather reinstall the IE if u wish to stick to it.

How do i findout what in my computer keeps changing my homepage to gophersearch.com. norton says no viruses?pop up blocker

READ FULLY BEFORE DOING IN ACTION.

Believe in my answer. Get "Ad-Aware" from http://www.lavasoft.com/

Update the defnition files. Do a full-system scan and delete all detected items. Then, restart your system. Then restart your browser, reset your homepage and other settings. Your computer shouldnt trouble you a lot from now.

It must have become OK. If not, format your system as someone said already. Note: backup your important data in a CD or in some online server before formatting. Formatting will delete all data from the hard disk.

I AM NOT RESPONSIBLE FOR ANY DAMAGE.
No way. Just forgot about wasting the time of removing. Format your system.
Try scan with ZoneAlarm anti-spyware (inside ZA Firewall)