Download a copy of AVG Anti Spyware from here and do a scan.
If that doesn't work, download a copy of HijackThis from here and post the log back here and we will have a look for you
__________________ Rig Specs: Custom Built: ASUS M2N4-SLI
AMD Athlon 64 X2 Dual 4600+ 512MB SLI NVIDIA GeForce 7950GT OC
2.00 GB Elixiur RAM 400GB Hitachi SATA II HDD
Western Digital 120GB IDE HDD Samsung SyncMaster 932B Monitor
More to follow soon.....
Download any free anti-spyware program that can help you from hijackers
I recommend you to download the program called Spyware sweeper
This will manually remove the spyware, which is hijacking your browser.