Windows 2000 gives error "network request not supported" With Exchange 2000 Enterprise. Can't logon locall or through RDP.

I'll start from the beginning.
I recently installed windows 2000 Advanced server, then Windows 2000 Exchange enterprise.
I moved my mailbox to the new server.
Everything was running ok for a few days, then yesterday afternoon, I stopped getting emails. When I tried to log to the server locally then through RDP, I recived the follwing error :
" Network request not supported".

Rebooting seems the resolved the problem for about 12 hours. then this moring I got the same problem.

Any help would be appriciated.

Very urgent issue, I would give more points if I could :)
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Seelan NaidooMicrosoft Systems AdminCommented:
have you verified DNS is working correctly?

have you disbaled the Windows based firewall of the NIC ?

Have you applied all Service Packs and Roll up patches to your server ?

Are you using an ISA server to publish Exchange ?

If a reboot "seems " to fix the problem then perhaps something is running in the back ground that is changing DLL files or network files. Check the event logs for the approximate time you think the problem occurs and see if you find anything. It could be a virus scanner that is changing files, or perhaps a spyware scanner. Has anything changed on the machine itself?

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pwslglAuthor Commented:
Ok. to answer SeanUK777:

DNS seems fine.
No firewall settings exist
Its runnintg service pack4 with Excange sp3
I am not currently using ISA.

pwslglAuthor Commented:
I tcould possibly be the Sumantec AV for Exchange. There were two modes to choose from when I installed it, I chose the "VSAPI 2.0" or "MAPI". The first time I chose the VSAPI 2.0 - perhaps this caused the problem. I just reinstalled it with the MAPI Option. I'll monitor it for 24-48 hours.
pwslglAuthor Commented:
The AV reinstall or even uninstall did not resolve the issue.
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Windows 2000

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