It would be a good idea to get your system checked out by our malware staff. If registry data is infected, it could be causing a lot of this.
Please go to the Malware Forum
and read the stickies located at the top, especially this
The guides will give you several steps that will help you clean up 70 percent of all problems by yourself. Then you can post a HijackThis log in THAT forum. Be patient, the Malware Forum is a very busy place and a two or three day wait is not unusual. Only after a three day wait may you move to The Waiting Room
where you will be on the top of the list to be helped. A three day wait is 72 hours.. Make sure it has been over that amount of time, or your Waiting Room topic will be closed.
If you are still having problems after getting a clean bill of health from the malware expert, please return to this thread.