Microsoft has created a site where you can upload error reports generated by STOP errors and get them analyzed. You can submit an error report and return later to get the analysis. From the site:

Microsoft actively analyzes all error reports and prioritizes them based on the number of customers affected by the Stop error covered in the error report. We will try to determine the cause of the Stop error you submit, categorize it according to the type of issue encountered, and send you the initial results by e-mail within 24 hours. You can check the status of your error report at any time. However, because error reports do not always contain enough information to positively identify the source of the issue, we might need to collect a number of similar error reports from other customers before a pattern is discovered, or follow up with you further to gather additional information. Furthermore, some error reports might require additional resources (such as a hardware debugger or a live debugger session) before a solution can be found. Although we might not be able to provide a solution for your particular Stop error, all information submitted is used to further improve the quality and reliability of Windows.

See Microsoft's Windows Online Crash Analysis site for Windows NT, Windows 2000, and Windows XP.

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