Microsoft has revised their security advisory about the vulnerability in IISs WebDAV function announced earlier this week. Some versions of Windows 2000 are incompatible with the patch, explaining reports of servers blue-screening in the field with a Stop 0x00000071.
In the advisory expand the "Additional information about this patch" section for full details. SP2 systems where the %windir%\system32\ntoskrnl.exe file has a version number between 5.0.2195.4797 and 5.0.2195.4928 (inclusive) are not compatible. These versions were only distributed through hotfixes. Windows Update and Microsoft Software Update Services do not check this version number.
Systems crashing because of the patch must be recovered with the Windows 2000 Recovery Console by restoring the previous ntoskrnl.exe file from the \winnt\$NTUninstallQ815021$ directory.