For reasons unknown"Windows Installer" became unuseable on my quite fresh W7 64-bit installation today. That means I cannot neither install nor uninstall things.The last thing I installed today was Nero 7. After that I encoded a DVD via Nero Vision which made the computer BLUE SCREEN right in the middle of the calculations.Later I ran Prime 95 to test stability and after more than half an hour the computer hang. Screen was black, power-draw/wattage was down to Idle eventhough it should have been at least double as high because of the maximum CPU load.After that the Windows Installer must have become corrupted.Windows Explorer also keeps crashing quite often when I'm trying to do configuration or installation work.After several BLUE SCREENS, Explorer crashings and now this I am not half as much convinced that the BETA is as stable as people keep calling it.