How do I fix the Serious Startup Error Type 199 message?

This error code is returned by Mathematica when the front end is having difficulty accessing the Mathematica preferences folder. This problem occurs most frequently with users of Windows NT 3.51 and 4.0.

Please see the following page for more information on diagnosing this problem.

http://support.wolfram.com/mathematica/systems/windows/nt/startupfails.html

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Questions or comments? Send email to support@wolfram.com.