Vista - Can't add a Windows Logon Credential

I have Vista Home Premium. I have drive z: mapped to drive c: on another
computer in my network. I use wireless and it takes a minute for my wireless
to come up, and by then Windows has already said that it cannot connect to
the mapped drive. When I manually connect through My Computer i have to
enter a password to let me have access the docs and settings folder. I went
to User Accounts > Manage Network Passwords and tried to make a windows
logon credential but the option was shaded out. I think this might be
because of Home Premium. If not please let me know. As a work around i made
a NET USE batch file with all the necesary commands and my password in it
(yea i know not really safe) that runs as a scheduled task at logon. If I am
going to have to do this because of the inability to add a windows logon, do
i need to set /PERSISTENT: to yes or no in the batch file? Thanks in
advance!
guitardude