Alpha antivirus

I installed alpha antivirus, believing it's information that I have trojens on my computer. Before I got to the stage of registering it, I blocked it with my Trend antivirus. Now I can't register it to try to take it out. I have tried to remove it by temove/repair and it will not uninstall. It even shuts down my computer. I have vista on my computer. Please help me. Thanks, Barbara

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.