Can't see network drive

Running Win 7 home premium on 2 new computers, 1 desktop in office, other is laptop. VPN connects from laptop to desktop. While in office and during testing at several off site Wi-Fi's I was able to access shared folders on the desktop. Now that I am several states away in my home/office I can connect the VPN every time (office confirms VPN connection) but am unable to "see" the desktop to access file folders. We have tried taking down all firewalls but still no network drives available. Any ideas?:confused:

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