Database Design question

I am designing a custom database for tracking various pieces of software we
use at my job. Each user has access to different pieces of software and many
pieces of software require a separate username and password for each user.
I'm trying to figure out the easiest/best way to do this. I'm using our and
Employee table with EmployeeID as the PK and the EmployeeID FK in the
Software table. I can either create a Software table that lists a field for
each type of software and a separate username and password for each piece of
software (which I know is poor database design) OR create a many to many
relationship and create another table. The part that's throwing me off is the
password/username part. Each person will have several usernames and passwords
(one un/pw for each piece of software). Does anyone have any suggestions? I'm
using Access 2007.