Tempdb

Can anyone shed some light on this error I see in the Errorlog
Could not allocate new page for database 'TEMPDB' There are no more pages available in filegroup DEFAULT. Space can be created by dropping objects, adding additional files, or allowing file growth..
Error:1101,Severity:17,State:8
There is 87gb of space on the disk Tempdb is on. Autogrowth is on and is unrestricted.

What DBMS are you using? Perhaps you should post your question in the specific forum for that DB?

OOPS. The DBMS is SQL Server 2000 SP3 on Windows 2000.