This is painful.
I have a mixed-language program and ran the debugger. One of my Fortran subroutines has several entry points. I wanted to check the value of an input argument to be sure it was the same as the calling program's value. I held the mouse over the variable name, and nothing happened. (Usually, it shows the numeric value.) So I dragged that name into the Watch pane.
The system froze. Nothing responded to anything. Ctrl+Alt+Del did nothing. I tried it lots of times, and then got a blue screen.
Rebooted, and my desktop icons were in all the wrong places. My network did not work. Hours on the phone with three tech support guys, who tried everything. The restore points were corrupted.
They said I had to wipe my disk and reinstall everything. Ugh. Anyone who's used a computer knows bad news when it hears it. It's not nice to scream and weep in public -- but this was definitely the time.
I now have some of my stuff reinstalled, but the network still does not work. I'm not an expert in that, and it will take me several days of dumb trial and error before it works again. Fortunately, I had a backup copy of all my source files, so it could have been worse.
Be advised: if you use the debugger for a Fortran program, you have entered a minefield. Does the programming team know about this?