Despite its alleged repair and reinstallation of Win10, my HP is still freezing and crashing...
31 Oct - rang Knowhow who advised a short test. That showed a C:drive error, so they told me that once that was corrected, to check again.
I did - no better.
1 Nov - rang Knowhow again, this time they advised an extended system test, then to check again.
I did - no better.
2 Nov - rang Knowhow again, this time they advised a system reset to reinstall Win10, then my antivirus program, then check again.
I did - still freezing and crashing, with the occasional 'Thread stuck in device driver' BSOD and reboot. I rang Knowhow again and they told me that there wasn't anything more which they could recommend over the phone, so to take the computer back to CurrysPCWorldDigitalDixonsComet again...
During the evening, the computer managed to download and install more Win10 updates, but it still doesn't work correctly. This morning it froze yet again; after a restart I tried watching YouTube and that was nigh on impossible - audio crackling, a few seconds of motion then long periods of static image...
Knowhow have been very courteous and understanding, but the computer will going back to the shop today on double secret probation - last chance before it gets an involuntary flying lesson!