I hope this advice saves you as much as it saved me!!
Basically I had the same problem I keep seeing. Hi-Jack Browser re-directs or when you go to google or yahoo and search for something and click....it goes to some advertisment page. Did this in 4 different browsers
Trust me...after 10 days I tried everything, 2 antivirus, 10 anti malware progs, all in safe mode and nothing fixed it.
After a week passed I read a posting somewhere that said, "If you are running wireless and have hi-jack re-drirect problem try resetting your router and immediately change your admin password and put security encryption on it" "You may have had something get into your router and corrupt your DNS settings"
WOW! IT WORKED!!
I went in there and reset my router (press small button for 10 seconds) and did the above and I get no re-directs.
I know this may not solve everyone issue but it may help. The reason no software could fix my poblem is because it was my router the whole time!
Have a Great Day!