Impossible to install a password for the administrator

I tried to install a password for administrator on my PC. I am the administrator and have another account for a "guest." Whenever I try to install a password, he comes back and says that he can do. There has never been a password installed. I talked to Dell who said best Buy never changed ownership when I bought the computer (which it was a display model) and when I called Best Buy, they said that never "own" anything. I called my computer guy and he said there is a problem with Windows and I should put it in. They want all the money to fix it and I think that since it is a mistake to "Windows", then I don't have to pay so he can get fixed.
I just went on live Windows and tried to update and she returned with
"SYSTEM ERROR DETAILS".
CODE 0X8000FFFF
"DESCRIPTION CATASTROPHIC FAILURE."

I really want to install a password on my account. Can you help me to find out what's wrong with my computer?

Hello

If you suspect a virus activity I recommend you download the Microsoft Security Scanner and run it in safe mode.

Microsoft safety scanner

See also the following articles.

Require strong passwords on this computer
http://Windows.Microsoft.com/en-us/Windows-Vista/require-strong-passwords-on-this-computer

Tips for creating a password
http://Windows.Microsoft.com/en-us/Windows-Vista/tips-for-creating-a-strong-password

The Windows password problems
http://Windows.Microsoft.com/en-us/Windows-Vista/troubleshoot-Windows-password-problems

Hope that helps.

Tags: Windows

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