VPN connects but can’t map network drive / view files

Hi.

I’ve got an XP Pro machine setup as a vpn server/host. I’ve also got a Vista Business laptop setup as a VPN client. The connection works like a dream: no problem there (that I know of) but I can’t map a network drive from the laptop to the server/host.

I’m not sure what to tell about settings but will post info as required.

Update: Somehow I got to map a network drive to a folder on my drive (I’ve no idea what I did to get this). The mapped drive will sync no problem, but now the connection won’t let me map any other folders i.e. I can’t see the pc, drives or folders again. Hope this narrows things down a bit.

Your assistance is much appreciated.