problems with internet explorer 8 beta 2,virurs?, poping up pages

i downloaded internet explorer 8 beta 2, it was working great ,intil i let pc tend micro allow something to pass, now when i explore the interent random pages will pop up for no reason like funnyordie.com,blogspot.com, and w/e. so i ran trend micro pc-chillen to find this virurs or w/e , couldntfind it. so i deleted internet explorer 8 and re downloaded it. and its back. what can i do? anyone esle got this problem!?!??!?
oh and when i go to myspace and facebook etc, it takes forever to sign in(never did till this problem started)