The Home Directory field in the user manager just sets an evironment variable if you are using the Local Path option. I'm guessing that is what you have selected since you said you are mapping the drive via your script.

code:

IF %OS% = "Windows_NT"
        SET "HOMEDRIVE=H:"
ENDIF

This will reset that variable. Now, you can go back and at your leisure either change it in the User Manager or just remove it.

Rick