http://support.microsoft.com/kb/266745
Error Message When You Run fixmbr Command
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Article ID : 266745
Last Review : February 28, 2007
Revision : 3.3
This article was previously published under Q266745
SYMPTOMS
When you attempt to run the fixmbr command in the Microsoft Windows 2000 recovery console, your computer system may display the following error message:
This computer appears to have a non-standard or invalid master boot record. FIXMBR may damage your partition tables if you proceed. This could cause all the partitions on the current hard disk to become inaccessible. If you are not having problems accessing your drive, do not continue. Are you sure you want to write a new MBR?
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RESOLUTION
Ignore the error message described in the "Symptoms" section of this article. The fixmbr command can safely rewrite the MBR.
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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.