NT4-error: "Fat File System"

This is what I found on the Knowledge Base of September. The article was was written for NT 3.51... May be it helps.

Stop 0x23 Errors in Fastfat.sys
Last reviewed: March 24, 1997
Article ID: Q142628  
The information in this article applies to:
Microsoft Windows NT Workstation version 3.51
Microsoft Windows NT Server version 3.51
SYMPTOMS
A STOP 0x00000023 FAT_FILE_SYSTEM error message occurs when a floppy disk is inserted or removed while Windows NT 3.51 is in the process of shutting down.



CAUSE
The version of Fastfat.sys distributed with Windows NT 3.51 has the potential of showing the above symptom. There is a very small window of time while Windows NT is mounting a FAT volume, such as a floppy disk, during which a request to determine whether or not it is safe to unmount the same volume may cause the above error.



WORKAROUND
Install Service Pack 5 or later for Windows NT 3.51.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51. This problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):


   S E R V P A C K
 


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Additional query words: prodnt
Keywords : kbbug3.51 kbother ntfilesys NTSrvWkst
Version : 3.51
Platform : WinNT


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Last reviewed: March 24, 1997
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Try reintalling winNT with service pack 4, or just reloading NT.