it is very unlikey to be those windows update reports, as oncly one program - calibre- is frezeing.
we are still waiting for some brave soul to do the safe mode test.
start windows in safe mode then start calibre
Start Windows 7/Vista/XP in Safe Mode with Networking
Immediately after the computer is powered on or restarted (usually after you hear your computer beep), tap the F8 key in 1 second intervals.
After your computer displays hardware information and runs a memory test, the Advanced Boot Options menu will appear.
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