I bought a new computer with Vista Home Premium installed on it, it also had Norman Anti-Virus, I uninstalled it and installed Avast. Avast worked perfectly for a couple of weeks, and then suddenly I couldn't get any kind of real time protection started, not automatically, nor manually. I also have these programs on my computer, could they have messed up my Avast? AVG Anti-Spyware 7.5, Spybot S&D, Ad-Aware 2007. I have also tried uninstalling, rebooting, reinstalling and then rebooting many times, also tried to download a new installer, but that didn't work either.