Looks like your TempDb is running out of space.
Are you the database administrator?
The Fonzi approach (not reccomended) would be to restart the SQL Server Service on the server because the tempdb is recreated each time SQL Server is restarted.
In the Enterprise Manager you can right click on the tempdb and check the file growth propeties and adjust them as necessary.
Finally, I wonder what your query might be doing to fill up the tempdb. Do you want to post your script or tell us what you are trying to do?
If one brings so much courage to this world the world has to kill them or break them, so of course it kills them. The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry. Earnest Hemingway, A Farewell To Arms.