Thanks Christianb for posting this at the forums:

Microsoft has released a 6 floppy bootable corrupt registry repair tool for Windows 2000

The Windows 2000 Registry Repair Utility can be downloaded on to floppy disks and then run on the system with the corrupted registry. You must have six floppy disks to download this utility. The utility will try to repair the corrupted registry and permit the computer to start again.

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