mapped drivers not keep password

Hey everybody I have a question..
I want to know has anybody is having problems when mapping a drives that when you are using the connect as different user name/password. Does the reconnect at log applies to that?

I have some user that when I mapped a drive and that connect as different user/password it stick for that day.. but when they reboots that authication to the mapped drive is gone.

everybody is on Wxp sp2. no AD