Windows 7: Transfering files using Homegroup freezes computer

I have two computers with Windows 7 64 bit set up as part of a Homegroup. I can see the computers from each machine and even browse files/directories. However, when I try to cut and paste or drag-n-drop files from one machine to another one machine freezes and requires the reset button to restart the machine. It is only one machine that freezes, but it consistently freezes every time I attempt a file transfer. The computer that freezes is connected wirelessly to the network. The other computer is wired to the router. I am stumped. I have tried all new drivers, latest bios, etc. Anyone able to help me?

Follow this great tutorial on transferring files: Transferring files and settings: frequently asked questions.

Cheers,
Tara
Windows Outreach

I think I have everything set up properly. The problem is, every time I try to start a file transfer my computer locks up and I am forced to shut the power off in order to restart the machine. There is not an error message, or blue screen. The computer simply freezes, and I can not move the cursor or anything. It is just the one computer connected to the network wirelessly that does this.