I don't know what I'm doing!!!!

I've got SQL Server 7.0 running on an NT box. I've set up two maintenance plans that are supposed to run daily. I had problems with running out of disk space (wasn't deleting the old files), but that's fixed now.

Now, I can't get the backups to run when they are scheduled. I get no message or anything. Nothing is showing up in the plan history.

Does anybody have any ideas?????? I'm sure I did something stupid, but I don't even know where to look.

I know you have to have the database stoped before NT will do a decent backup of SQLServer, dont know if that helps.