i can't access my network drives, via vista's vpn connexion to sbs

i have windows sbs 2003 sp2 server, i access to my office network with
windows vista (no sp1 yet) vpn connexion remotely.
i have already a network drives that i use in my office, but remotely with
vpn I can't access them.
other question: when i open a session with vista, it ask me to give
permission to execute a file i think it relate with the sbs2003 environment.
And when i press authorise, it doesn't executed a display me a message

any help, will be appreciated