I’ve been a long-time fan of AVG Free Antivirus, until recently when I had to swap to Avast because it worked with Vista 64, and AVG didn’t. That said, with free antivirus software you’re always running the risk of ‘getting what you paid for’ and experiencing a show-stopping bug.

Well, AVG’s show-stopping moment occurred on Sunday. It somehow got it into its head that user32.dll – a critical Windows file that lets users interact with programs – contained one of two Trojan Horses – PSW.Banker4.APSA or Generic9TBN. AVG, hilariously, recommended deleting the file, which would cause a system to either fail to boot, or get stuck in a continuous reboot cycle.