If it is a windows use the Ctrl, Alt, and delete keys at the same time. It will bring up program manager with a menu that will have several items on it. You can "unfreeze" it by ending a program or you can shut it down. If it is Apple go up to your Apple Icon at the top of your screen and highlight "shut down."
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depends why it froze, if it is software then probably best not to use windows anymore. If it hardware, buy something better.
Press Ctrl Alt Delete On you laptop at the same Time then close it
ifs its still frozen Restart the Comp :]