Nt Log on Scripts

I currently have my Log on script set up as follows.
Net use H: \\PServer1\H
Net use L: \\Pserver1\L
Net use E: \\PServer1\E

How do I configure my script so it will delete and then remap these drives again?
I have users that I had to physically map the drives from there workstation because their log on script will not execute when they log on to the Network,Even though there user profile does contain the name of the Script I created.I am running under NT4.0.
Help?