@alfred.s - There are ~3.5 million active calibre installs, 85% of which are Windows, i.e. ~3 million on Windows. AFAIK you are the only person with this problem, hard to believe it could be the calibre software.
In 2011 I was ask to look at a Vista system that was getting an occasional BSOD, but only when running Quicktime, and only when watching MOV videos, AVI's were fine. But no problems in Office, Quicken, Autocad, Photoshop, Elements etc.
Windows event log was showing memory faults shortly before it crashed, ran the Windows memory test, it detected some errors. So we replaced the DDR2 memory. Voila no more BSODs when running QT or anything else.
Why only QT and why only MOV's? No idea - all I know is that the owner was happy and I got a book voucher.
BR
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