getting A specified authentication package is unknown. error when going to a shared drive

Hi Guys,
I have been chasing this error for a while.
I keep getting this error when i try to access the netowrk drive.
A specified authentication package is unknown.

I am on win2k server sp4 and i cant get to any other computers in the
network.
i can resolve the error after a restart, but it comes back after 5
mins.

In the event viewer i get this error.
Source LsaSrv,
"the security package negotiate generated an exception. The package is
now disabled. the exception information is the data"

Any idea how i can solve this?
I have done virus scan, but i dont think it is the cause.

It is a clean installation and the only software is the oracle 9.2.0x
server.

thanks in advance!

.