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Open Question: My computer went from great to...?

crazy in a matter of two days! I come home one day and the screen is all changed, it wouldn't connect to the internet. Now when I turn it on it says "back up files, and have your hardware replaced". Now when I upgrade sum programs it uninstall them but won't reinstall. When it trys it says i'm not the administrator of the computer..When I am. What do I do?? HELP!!
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