Sounds like bad hardware, copying roms over should not freeze your machine.
I'm sure that's a possibility as well. It didn't freeze while I was copying them over, it did it afterwards when I was finally on the box and checking some of the roms out. Wanted to make sure everything was running properly. It should get a good test run tonight. Either way, I'm sure the Media Center will end up with some much better hardware before long. Been talking about building a new PC for the wife to run her business. Wanted to become familiar with what's out there so I just used some spare parts laying around in the mean time.