Prompted for Password Creating New Table Access 2K

[ICU2Desktop]

I work with a user who uses Access 97 and Access 2K. He created several databases in both, which he has made password protected. Now,all of a sudden when he tries to create a new table in Access 2K, the password box pops up and when he enters the ID and password, it gives him an error message "password invalid", but we have tested the ID and password opening the databases and it works. Any ideas why this might be happening? Thanks