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I installed TweakMASTER as administrator on my Windows XP computer but now my wife can't use it.

TweakMASTER Knowledge Base article KB0104

"Fast user switching" in XP is not officially supported. Only users with Administrator privileges can use TweakMASTER.

If you log in as a different user, and TweakMASTER runs in the "evaluation" mode, you can safely enter your registration info. Provided, of course, that you do it on the same computer where you already have TweakMASTER registered.

On the other hand, all changes done by TweakMASTER for one user, will also apply to all users of the same computer automatically.