RegRun is excellent tool kit for protecting your computer against viruses or Trojans or spyware or Adware parasites. It uses the newest technology in the world.
Fight with the bad guys using the most powerful weapon. However, RegRun is not an antivirus in a common sense. It does not scan your disk and detect/cure using signature database.
There are a lot of antiviral software that you can choose. RegRun checks all Windows startup holes and it can detect and remove any unknown virus.
The modern viruses spreads to the millions computers in the world for a pair days. First, a virus kills an antivirus and disables a way to update the antiviral databases.