What site do u get redirected to? Cuz it sounds like ur browser has been hijacked..don't stress out now..there's a solution...see if this works:
Do an adware/spyware scan with Adaware:
http://download.com.com/3000-8022-10214379.html?tag=lst-0-2
followed by Spybot Search and Destroy:
http://download.com.com/3000-8022-10194058.html?tag=lst-0-2
delete what those come up with..
if that doesnt work try:
HiJack This :
http://tomcoyote.com/hjt/
Or tell what site u get redirected to an i'll try to find the right deleter