I will try to keep this as simple as possible, though it requires some technical skill. This guide assumes that you have XP Mode fully setup and you have two network adapters (whether wireless or not). I will call the virtual PCs VMn.
1. Duplicate your XP Mode as explained here.
2. Create an "Internal Network" then attach one of you network adapters to VM1. Do the same to VM2 with the other network adapter.
If this is a wireless adapter, connect it now to the desired access point.
2. Start your torrent on both VMs.
3. Finally, add VM2 as a peer on VM1.
The IP address you must supply is the IP Address assigned to the VM2's private network adapter. (hint: cmd->ipconfig). The port can be found on Options->Preferences->Network in uTorrent (also on VM2).
4. Repeat for more network adapters.
The two torrent programs should start sharing downloaded pieces (the download speed will shoot up when this happens). This saves two copies of the torrent in your hard drive, so just delete the other one when it's done downloading.