For the last week or so, my Bitdefender Antivirus 2009 keeps shutting down on its own. It usually happens at night while I'm asleep. When I come back to my computer, I have a message from Windows Security Center saying that my antivirus is turned off. When I double click on the BD icon, it says my subscription has expired (which it hasn't...I still have at least 9 months remaining). So, I restart my computer, BD loads, but I have to manually go into the settings and check the "Real-Time Proctection is Enabled" box in order to get BD to start working again. Everything will work fine all day, then when I wake up, I have to do this all over again. Any suggestions?