I also could not get XP in NetEdit or v2.6 Select PLC Connection to see a brand new out of the box BRX on the Ethernet port a few days ago..
I also had to enter the MAC address and do the single IP.
But I also have 4 different subnets configured for the same physical port. This usually works very well for me due to OEMs using 192.168.0.xxx, general use at .1. and work network on .3. along with a whole different one for another vendor's default.
NetEdit 3 will allow me to choose any of those "adapters" on TCP/IP, but couldn't see the PLC with no IP address.
Select PLC Connection can see the PLC now that it has an IP, but won't let me select the "adapter" I need so is stuck at .0. But it still connects and works anyway.
I didn't try to use a different windows version as I just needed to get on with it (and Windows XP is not supported anyway.)