Background: We have an accounting business that services multiple clients. All of the clients files are stored on a single server system which also must be able to access the account files on the server. We have 4 additional computers (hardwire attached via a 1000 Mbps) network that must be able to access any of the customer files on the server. We use Quickbooks exclusively, but to be compatible with our clients, we use releases 2007, 2008, 2009 and 2010 of Quickbooks. We needed a higher performance and more reliable system for our server system so we replaced it with a 3 gig quad processor with fast disks. This system came with Windows 7 pro and a processor capable of supporting virtualization. Only QB 2010 is compatible with Windows 7 in native mode so we activated virtual XP and installed the older versions of QB in the XP environment. Now for the problem: Everything seems to work fine except for file sharing between the virtual and non virtual environments. All applications on the remote processors can share files on the new Windows 7 system, but the applications running in the virtual XP mode no the Windows 7 system cannot access these files. I have looked everywhere and tried everything I can think of to no avail. Also, for background info, the remote systems are Vista of XP sp 3.