Well I thought I'd let this, and the other slow PC threads chug along, till the time was right to provide the real answer.
Save your work, format the disk, and reinstall windows, and once done, stick to the windows AV and firewall and stop dicking about with all the useless resource hungry antimalewarebitesdefender third party rubbish.
At the end of the day, windows always has and always will be in need of regular reinstalls. Its the only cure that going to be a reliable fix (till the next time windows needs to be reinstalled, in about two years)
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