For some time now that whenever I install new updates on my Windows 7 (Ultimate 64-bit), the system freezes in the welcome screen after reboot. The screen shows up but both mouse and keyboard are useless. Problem is fixed after I restart the system and choose the last known good configuration option in boot screen. After that, Windows boots normally and works fine.. Funny thing is that the new updates show up as installed.
Any ideas why the welcome screen freezes?