Heuristic Virus

Please can you tell me how to check and remove this virus MH690A. It keeps trying to access my computer, but Norton Internet Security is blocking it every time. How long will it keep doing it, and is my computer safe? Noerton seems to being a good job at the moment.

Please download the current version of HijackThis from HERE

• Double click and run the installer.
  
• It will install to C:\Program Files\Trend Micro\HijackThis\hijackthis.exe
  
• After installing, you should get the user agreement, press accept and Hijack This will run.
  
• Select Do a system scan and save a log file. This will open a notepad file of everything Hijack This found, copy and paste it back here.