There are different steps you can take to fix your computer after it has been frozen. If your computer freezes while you’re running an application, but your mouse is still operation, you should press CTRL + ALT + DEL. This will bring up your task manager. Go to the application that is frozen and forcibly shut it down.
In the event that your computer is locked completely and it doesn’t respond at all, even when you do the above, then you should hold down the power button and perform a manual shut down on your computer. You should note that any unsaved data that you may have had before the shutdown will be lost. It’s always important to automatically save or back up your data in case of an emergency.
The final fix to your computer crash should only be done as a last resort. Your computer may have had an important system file deleted or corrupted beyond repair. In this case the only thing you can do is a system restore.
A system restore will essentially reset your computer operating system to the way it was a few weeks or even months ago. You can set it back to a time when the computer was running smoothly. Note that anything that you created or downloaded before the system restore will be lost forever, so backup any important files.