Help Me???

Every time i am browsing the internet, page i try to view is always redirected to google search images usually to view.atdmt.com or ad.Doubleclick.net i Have blocked those sites and it doesnt change anything, i have Windows Vista Home Premium and i use Webroot spyware sweeper and Trend Micro Antivirus to scan my computer and i never get any results, my computer is always clean. Does anyone know what wrong or what i can do to fix my problem?

i used webroot spyware and i will tell you now, it absolutely sucks!!!! my computer got another virus after trusting this program. i took my pc to the computer place (a local place, not best buy or any franchise) and they intsalled AVG virus software. omg, i look through the history of the virus scans, not even 1 shows up- viruses are not even trying to install themselves on my computer!! i dont even get pop up ads. AVG is a computer lifesaver. i never liked norton or mcafee, i felt like they slowed my comp down and had too many security checks. please, if you want real advice from someone who uses the internet all the time, please look this software up. i will never go back to another. apparently this is the antivirus gamers use (around here anyways) it was $50 for a 2 year subscription and i will renew everytime that comes around. good luck.

How to speed up your PC: RAM.vbe