Windows 7 & 10 dualboot; 10 works, 7 shows BSOD 7b

I

ico2k2developer

For more than a year now, I have had a fully functional dual boot setup on my HP ProDesk 490 G2 including the original Windows 7 Professional 64 bit and Windows 10 Pro 64 bit installed by myself. When I switch on my PC, Windows 10 boot manager starts and ask if I want to boot to Windows 10 (default) or 7, with a 5-second timeout.Yesterday I have booted to Windows 7 with no problems after a long time since the last time I did it, and everything went fine; I have done some driver updates if it can be relevant. However later, after some dust cleaning inside the case while

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