Windows

Reinstall the service pack (4 or greater). If that doesnt help, do the following:

1) Open the registry (REGEDT32.EXE).

2) Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
and add value MinFreeConnections with a REG_DWORD of 5 (decimal).

3) Right click Network Neighborhood and select properties. Select the Services tab. Select Server and click configure. Under optimizations, select Maximum throughput for File Sharing.

4) Reboot.

Have you recently installed any new software that would eat up Disk space ?

Try looking at the free space on the drive where NT Server is installed (e.g. C: Drive). If you cannot get to the Server login, then you will need to boot from floppy disks!

If there is plenty free space there, check total/free memory (Physical RAM). The POST screen or Hardware Setup utility should tell you that.

I agree with proposed answer 1. I had the same problem last week on two machines. Re-applying the SP, in this case 6a, fixed the problem.

Reapply whatever service pack you are currently at....equal to or better than SP3.