Do not turn off your computer!
After receiving a similar message a few days ago I Googled what to do and after a few seconds I had many possible solutions. I chose one (pressing my control - alternate - delete keys all at once) and the problem was solved. Googling questions does not always solve problems but it usually offers reasonable suggestions. Sorry you caught Best Buy at a busy time — I doubt whether they would have charged you for their 10 second fix either.
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