Google, yahoo and links bring up wrong page, only serious answers please?

Any time i run a search in google or any search engine on my other computer it brings up the wrong page in a new tab. ALSO, here's the important part for everyone who's about to say something about ad_aware, or spyware, i can't get to any site that has anything to do with virus removal. For instance, i can go to almost any site just by typing in the address in the address bar, however if i try to go to norton.com, lavasoft.com, any sites like that it wont let me. As well upon startup i've noticed a profile, filed as administrator that isn't my profile. Anyone know anyway to fix this? Also due to not being able to connect to these sites after i download the programs like adaware from a different site i can't download the updates cause it won't let me connect. and every anti virus i've run hasn't corrected the problem. please help and feel free to email with a more legthy explanation.