Yeah, I'm struggling with the networking as well. Seems that you can't designate a workgroup on Win7. The XP PC will be part of a workgroup (default MSHOME), but since you can't add the Win7 PC to that homegroup it won't work. I can see the XP PC if I look at the network map btw, just can't connect(?). Thought about renaming the second network (Win7 PC>switch>XP PC) to match the workgroup name, but the network is listed as "unidentified network" making it impossible to change.
Also, the second NIC has an invalid IP config according to Win7. Troubleshooter suggests resetting router, but my router isn't even on that network!
It's gonna take time to figure out, if it's even possible.
*edit: I has made progress
1. Right-click "computer" in start menu
2. select "map network drive"
3. in the window that pops up, select the "connect to a website that you can use to store your documents and pictures" link
4. follow the wizard. When you get to the 3rd window (I think), there's a "browse" button. Click it and Win will search the network, and the XP PC should pop up there and let you select a shared folder from it.
So mapping a network location on a XP PC from a Win7 PC works perfect.
Don't know yet about the other way around though.
