No the password was not changed.

It is not under local system account

Thanks for your immediate replies.

I tried with 3 logins but it still fails.I cant open query analyzer but it too doesn't work.:(

I restarted the service...

Great!!Thank you for your Explanation

Im clear now.Yes,my backup job contains the steps of deleting the old backup and backup database.Even though I have old backup in tape,i supposed to have...

All are database backup jobs.I have checked the error log files.It simply says that the job has failed,no any reasons for that.

Thank you paul for you immediate reply.

But it is a production server i cant add any filegroup now.

Without adding a filegroup can i do that?

Thank you all for your explanations.