Did you find the USERID to connect to the MSDE any where in the documentation?
Just in case you are still looking (I did for... well... ever!) If you did find it in the documentation some where... please tell me where. I would like to put my mind at ease, knowing that the UserID and Password were well documented items.
UserID = SA
Password = {blank}
Use your SQLEXEC() to create and populate the tables. Have fun!