Hello you can try a few things. Every time you boot your PC it will restsrt itself.
ONE open TASK manager and end the process,if you recognize it there. Then while it is stopped scan PC with your AV,then SuperAntiSpyware
(Free Home version and Dr.Web CureIt!
. Download,install ,update and save these to desktop. Reboot into Safe Mode before running all scans.How to start Windows in Safe Mode
Check the scan logs to see if it's been removed. Or reboot to Normal mode and see.
You can Post a HiJackThis log in the forum here and have the team remove it.Preparation Guide for use before posting a HijackThis Log
Or follow the somewhat laborious instructions HERE
to manually remove it. Before which you should backup your registry first
. Recommended tool for this.. ERUNT - registry backup tool