Windows 7: Virtual Windows XP Network Issue

I have read through most of these posts, but do not see that anyone else has had this issue.

I did a clean install of Windows 7 7100 64-bit, VM and Virtual Windows XP. The install of Virtual Windows XP failed, but on a second attempt it went fine.

Windows XP opens fine, has access to the Internet and "sees" the main Windows 7 machine with all its harddrive, shared files, etc.

However, it does not see any other systems on my network. This network consists of XP, Vista and Windows 7 boxes, set up as WORKGROUP. All other systems on the network can see each other and share. I also have the Windows 7 Homegroup set up.

All the systems use exactly the same user names and passwords (except the Virtual Windows XP machine that seems to insist on a user called "user."

In XP when you expand Netwok Places, Workgroup, it only sees itself with the standard shared folders, i.e., My Music, et al. Windows 7 sees the XP machine as a system on the netork.

I have tried all the tricks I know, but can't see to figure out why XP does not see the network.

Suggestions?

System:
2 Intel XEON 5050 3 GHz
2 GB memory
2 TB RAID 5 array
1 750 MB drive for the operating system(s).
2 - 100Mbps network ports (only one connected)
Virtualization set in BIOS