here is a good free program to keep most bad stuff out. it doesn't remove it. download-update & enable all protection. you need to check once a week for a update.
http://www.majorgeeks.com/SpywareBlaster_d2859.html
why don't you post a hijack log ,maybe someone can fix your present problem.
http://majorgeeks.com/Trend_Micro_HijackThis_d5554.html
Save HJTInstall.exe to your desktop.
Doubleclick on the HJTInstall.exe icon on your desktop.
By default it will install to C:\Program Files\Trend Micro\HijackThis .
Click on Install.
It will create a HijackThis icon on the desktop.
Once installed, it will launch Hijackthis.
Click on the Do a system scan and save a logfile button. It will scan and the log should open in notepad.
Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log.
Come back here to this thread and Paste the log in your next reply.
DO NOT have Hijackthis fix anything yet. Most of what it finds will be harmless or even required.