[Kolb]

It is time to start over with that PC and I mean from bare metal. The hard drive needs to be re-partitioned, fully formatted and Windows reinstalled. How technically savvy are you? If not very, this is a job for a competent PC shop...

[Blue Jays]

"...technically savvy..."

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My office software technician is a young woman named Hillary who suggests wiping the machine, like, with a cloth...and then smashing it with a hammer.

Good luck with reimaging and getting everything reinstalled.
Hopefully you have good full backups on an external drive.