Upload & Sell: Off
A friend has a laptop running Win7 32-bit, and I tried both the version of EOS Utility which was shipped with my 1Ds2, as well as the latest update, and neither would allow setting changes. The cameras were seen by the PC, but generated an error message stating no drivers were available, and Canon doesn't show any drivers on its site. For Windows users, keeping an old XP machine around seems like a good idea, but I wonder if the latest EOS utility is in fact compatible with the old 1D2 bodies? If I had a version that works, I'd avoid the update.
In the end, I installed a Snow Leopard partition on one of my Mac's, and used an older version of EOS Utility, which worked fine, through both FW400 and USB2.