I installed this most recent update to Premium Security under my Windows 7 OS, rebooted... and when I clicked on the tray icon to view the Avast interface menu, I get a totally black screen. Nothing to click on or interface with. When I hover my mouse over the tray icon, it shows "You are Protected". So the software seems to work fine, except that there is no software interface available, as I stated above. This seems like a compatibility issue with either Windows 7 (I have service pack 1), or some other software conflict with another program or computer configuration. I had no problems with any past updates until this one. Go figure.