Windows 7: trying to map win7 drive on xp machine

Current set up:
Win 7 Box(workstation)
-Dreamweaver

Win XP Box(server)
-web server
-wwwroot

I am doing web development on the 7 box, accessing the wwwroot over the network through a mapped drive. File access is slow. Since I am accessing the files from the 7 box more ofter then the xp box, I would like to move the wwwroot over to the 7 box, and have the web server access through a mapped drive(currently the other way around)



I googled, and tried to follow the instruction here:
Share Files and Printers between Windows 7 and XP - How-To Geek

I can't get it to work.

I have shared d:\intetpub\wwwroot as wwwroot on the 7 box.

I have tried to access from the xp machine as \\win7name\wwwroot but it can't find it.

I do not know how to add the xp user to the 7 box.

The 7 box will be connecting to a public vpn and I need the file share permissions to be very tight. The only thing I want shared is d:\intetpub\wwwroot and it should require a (strong) password.

I have been working on this for quite a while and can't get it to work. Please help.