Antivirus System PRO

This showed up om my computer this morning. I ran my webroot Antivirus and Spyware and got rid of the popups. How do I totally remove this from my system?

Thanks

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.