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How do I enable Windows XP user IDs?

While doing some work on his Windows XP machine, a user disabled all the user IDs, including administrator. Now he is unable to log on. Any ideas how to resolve this?

While doing some work on my Windows XP machine I disabled all the user IDs including administrator. Now I am unable to log on. Please let me know how to resolve this.
The easiest way to do it would probably be to perform an "in-place upgrade", where you reinstall Windows on top of itself and have the Administrator account's credentials reset. If you'd rather not do that, or you can't because you don't have the installation media or are dealing with other complications, you might want to try using a program designed to reset lost passwords. This site has several such programs, most of which are free. Be warned that if you are using the Encrypted File System in Windows and you change the password for the account used to encrypt data, that encrypted data will be lost.

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