From the sound of things you picked up a malware. Save yourself some money and go to
http://www.malwarebytes.org/ and download the program malwarebytes and it is free. Simple to use and keep up to date. Also a good anti virus program such as Microsoft Security essentials at
http://www.microsoft.com/Security_Essentials/ This is another free program. Now finally try
http://www.superantispyware.com/ and again a free download.
When you run each program you may find that each one finds something different which is okay.
Hummm $300.00, I should go into business, nah I did that type of work for over 10 years so I just wind up doing it for free.