This sounds like a BHO (Browser Hijack Object) much similar to CoolWWWSearch and some other BHOs that takes over your web browser and manipulate everything you do by redirecting you to their site. It is malicious and you need to remove it with such tools like CWShredder and HiJackThis. CWShredder has been successful at removing malicious BHOs such as the infamous CoolWWWSearch. However, HijackThis will display what your computer have and what your browser is using and when you look at the potential malicious BHOs, and by potential, not all BHOs are malicious. You know Google's toolbar, Yahoo's toolbar and more, they are good BHOs, but such as 1800Search, CoolWWWSearch and more, are bad BHOs. Anyways, in order to use HijackThis, you must have some working knowledge on how to remove files and programs from your computer, be able to decipher the HijackThis report and determine which one is malicious and what not. Adaware, Spybot and some other ad-ware cleaning program may not be successful at cleaning out the problems. You have to get your hands dirty and clean the computer yourself. The HijackThis program can help you delete such entries like BHOs and you may have to search for the folder that's causing the problem.
Download HijackThis. Once you download it, create a folder like this, C:/HJT (you have to make the folder yourself, by naming it HJT on C:/, not C:/Program Files or anywhere else, but on C: only, for the log file needs to be saved in that folder). Extract the program into C:/HJT and run the program. Post the logfile here if you wish, or post it on
http://forums.spywareinfo.com/, these dudes there are VERY helpful! I have had one computer filled with junk and such and some won't go away so I inquired the fellows there and they told me some things I never knew and I got the problems fixed.
HijackThis download link
Remember, when removing an entry in HijackThis, you should know what you are doing. That's why I am suggesting you post your log file here for us "techies" to read and tell you what we know, or go to that link at spywareinfo.com and post it there and you should get a reply in less than 24 hours!
Hope this helps!