Welcome to GTG
You may have some spyware and adware lets run some free spyware tools adware and spybot the downloads are in my signature after you down load these and run them then we'll take a closer look at what is running on your PC. We'll need you to use a free diagnostic tool (HiJackThis) and post a log back here with the results.
Click the HijackThis Guide
in my signature, download it and follow the instructions in the guide.
Most of what it lists will be harmless or even essential, DO NOT delete or modify anything yet! Someone will be along to tell you what steps to take after you post the contents of the scan results.