It does appear that you have been hijacked.
Please read and follow the directions for posting a HJT log; the preparation guide
will instruct you to download, install, and use several free anti-spyware applications; running these may in itself remove the malware. If the problem persists, then the guide will instruct you to run a diagnostic application and submit it for our volunteer team to analyse; a Team member will give you specific instructions to remove the malware the log has found, and help you with any questions or problems.
The Guide, which you might want to copy to your own computer for reference, can be found here:http://www.bleepingcomputer.com/forums/t/34773/preparation-guide-for-use-before-using-malware-removal-tools-and-requesting-help/