system
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Having managed to get into Safe mode with networking, I ran Malware Bytes, which found and cleaned pup.optional.
Trend housecall showed no infections, so I tried re-booting only to freeze at aswRvrt.sys so I can no longer even get Safe mode 
Previously it would just pause at this driver for a long time before entering Safe Mode.
Anyone any ideas please as I’m trying to organise a holiday on this infernal machine?