TFTPD fails to start, for RIS

My RIS setup has been working correctly for months- unchanged, I must admit I have not used it for at least a couple of months, i have been getting a service error at reboot and this is regarding TFTPD- the service is failing to start.
If I try net start TFTPD I get:

The Trivial FTP Daemon service is starting.
The Trivial FTP Daemon service could not be started.

A system error has occurred.

System error 31 has occurred.

A device attached to the system is not functioning.

The BINL service starts correctly.

In the event log I get "service control manager" error event id: 7023

I have checked the path in the registry for HKLM\system\CCS\services\Tftpd\parameters\Directory and it is F:\netinstalls\Drive Images\RiS- which is correct (KB 232115).
The machine is W2K server running SP4 plus patches (using SUS - so up to date), it is a DC and DHCP and DNS are on Linux boxes- these are all working fine and this is the only problem with this server.

I have not tried reinstalling RIS as of yet and do not really wish to do so just yet as I have a rather complicated setup with drivers etc.


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mikesjnAuthor Commented:
Thanks- but nothing helps

mikesjnAuthor Commented:
It will start if I use the administrator account in the service- not the local system account!!! I have checked the user rights to TFTPD.exe- anything else I should check, this was working.
mikesjnAuthor Commented:
Further to above other services are starting when running as system account and checked HKLM\system\ccc\services\TFTPD and system accounts rights are okay
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Windows 2000

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