What can I do to recover from a "frozen" computer?
If your computer won't respond to the mouse or keyboard, first wait a few minutes. Windows sometimes recovers on its own from what looks like a crash. If waiting doesn't help, press Ctrl-Alt-Del. Choose Task List and look for a program listed as "not responding." Select that program and tell Windows to close it.
If Windows doesn't respond to any of the above steps, then press and hold the power or reset button until your computer shuts down.