personal antivirus

my pc has been got by this Personal antivirus, i cannot un-install it, it wont let me. please tell me how to remove it cause it is drivin me insane, popping up every 5 seconds.

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.