Tempdb Log Full?? SQL6.5

Hi all,

I receive the following error message every time I run this script:

INSERT INTO archive_temp (mrn, folder, name)
SELECT a.mrn, a.encounter, a.name
FROM his..active a, cabinet..cabinet c
WHERE imnet like 'images3%'
ORDER BY a.mrn, a.encounter
GO

After 10 minutes I get this ERROR MESSG: Can't allocate space for object
'-1443' in database 'tempdb' b/c the 'system' segment is full. If you
ran out of space in Syslogs, dump the transaction log. Otherwise use
'Alter database" or sp_extendsegment to increase the size of segment.

So far, i've updated the tempdb log segment from 100 mb to 500 mb
shared with data. I don't understand why I am still getting this error.
When I look at Performance Monitor, the log for tempdb is not peaked at
all!

can anyone help?

Thanks
Chris