Run hijackthis and click on scan and put checks next to these:
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O6 - HKLM\Software\Policies\Microsoft\Internet Explorer\Control Panel present
Make sure nothing is open but hijackthis and click fix checked.
Reboot and....
Please download SilentRunners from here:
http://www.silentrunners.org/Silent%20Runners.zip
Unzip it to the desktop and double-click on it. If you get any kind of warning message about scripts, please choose to allow the script to run. When the scan is finished, a message will pop up and a logfile will have been created on the desktop. Please post the entire contents of this logfile for me to see.
Also go here and download trial version of a2 Trojan scanner and let me know what happens there.
http://www.emsisoft.com/en/software/download/