I do believe you are talking about Avast! antivirus (which is free). If set to its default settings it will say "virus database updated" it is neat at first (like having your own star trek ship computer!) and annoying later on. But I doubt it is there to scare anyone. I use Avast! because I grew up with McAfee and Symantec. They were terrible because they did the things you mentioned (slow your system to a crawl and made it impossible to uninstall the AV). I also got Avast! because it has the ability to check on 64 bit programs and most importantly it is FREE. I still work with Symantec at work (Air Force) but it has been pushed to the side and it is updated by a centralized AF AV server that rarely needs maintenance. The processing power has also increased to a point where I do not notice the background virus checks.