My Mac freezes, turns off and restarts.

My Mac keeps turning off. It freezes, shuts down and restarts. It's happening quite frequently, everyday, and I'm really worried now. It happens at least a few times everyday but it hasn't been as frequent as it is now. I'm not sure what it could be. A virus? I have a version of MacKeeper. Isn't that supposed to prevent viruses from infiltrating into my system? I'm not tech person so I'm really lost here. Any help would be appreciated. My MacBook Pro is from 2010. Thanks.

There may be other issues, but you should start by getting rid of "MacKeeper."
"MacKeeper" is a scam with only one useful feature: it deletes itself.
First, back up all data.
Note: These instructions apply to the version of the product that I downloaded and tested in early 2012. I can't be sure that they apply to other versions.
If you have incompletely removed MacKeeper—for example, by dragging the application to the Trash and immediately emptying—then you'll have to reinstall it and start over.
IMPORTANT: "MacKeeper" has what the developer calls an “encryption” feature. In my tests, I didn't try to verify what this feature really does. If you used it to “encrypt” any of your files, “decrypt” them before you uninstall, or (preferably) restore the files from backups made before they were “encrypted.” As the developer is not trustworthy, you should assume that the "decrypted" files are corrupt unless proven otherwise.
In the Finder, select
          Go ▹ Applications
from the menu bar, or press the key combination shift-command-A. The "MacKeeper" application is in the folder that opens. Quit it if it's running, then drag it to the Trash. You'll be prompted for your login password. Click the Uninstall MacKeeper button in the dialog that appears. All the other functional components of the software will be deleted. Restart the computer and empty the Trash.
☞ Quit MacKeeper before dragging it to the Trash.
☞ Let MacKeeper delete its other components before you empty the Trash.
☞ Don't try to drag the MacKeeper Dock icon to the Trash.

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