SQL Server 2000.

Hi!
After I killed maintenance process (57) in the current activity window and run ‘kill 57 with statusonly’ I got message: ‘SPID 57: Estimated rollback completion: 100%. Estimated time remaining: 0 sec.’
When I reopened current activity window I still see that SPID 57 is runable.
Then I run select*from
sysprocesses where SPID = 57
It also reports that process status is runable.
What is the problem?
How can I remove (and should I) this record from masterdb.
Thank you,
Natalia