Netgear FV318 & Prosafe Client - connects but can't access server share

I have a Netgear FVS318 at the office and Netgear Prosafe VPN Client installed on my laptop.
I have an XP Pro computer with a share at the office. The office network is setup as "WORKGROUP"
When at the office, I can see the computer in my network neighborhood andI can access the share just fine.
The computer with the share has a static ip address.(192.168.0.4) (computer name is "server" and shared folder is "sharedfiles").
From home, I can connect to the vpn just fine and can access the router admin menu of the fvs318.
I can also ping the computer that I am trying to get share access to.
I have tried \\192.168.0.4\sharedfiles and \\server\sharedfiles but neither work.
I don't see the computer in my workgroup either from home.
It was my understanding that once I had a valid VPN connection, my mapped drive to the share would work just like when I was connected at the office, but I guess not.
I believe I have the router setup properly and so does netgear support but they feel I need to adjust windows firewall settings or something else on the computer with the share, but don't know what to have me adjust?? I don't really want to turn off the windows firewall on that computer but do I need to? Is there any sort of wins or dns settings I need to adjust or lmhosts files, etc....? I am a noob when it comes to this sort of vpn stuff.