Hi Chris,
Thanks for the info.
It is difficult to say what's going on for sure, but looks like it is some kind of an interrupt conflict since the operation freezes instead of giving an error. There were some known cases when SATA and Network uses the same interrupt, but in your case the disk is IDE. However, could you try (if the BIOS support that), changing the interrupt assignments if network is sharing it with another device?
Other option is trying with the Realtek driver instead of Universal Driver. Probably this is not ideal since you need a separate menu item for these machines, but worth giving a try.
Krish