Windows 2000 domain with a single domain controller was suffering the following error message in NTFRS Log in event viewer. After advice from Microsoft we set the following registry entry:
HKLM\System\CurrentControlSet\Services\NtFrs\Parameters\Backup/Restore\Process at Startup
BurFlags REG_DWORD 0xD2
This forces a non-authorative restore for SysVol and allows the message to disappear - Setting it to 0xd4 would have forced an Authoratative restore.