I have a laptop and desktop which are 64-bit units and which are setup with Wizz.it. I activate the Windows XP Virtual Mode on both to upload/download. Nothing has changed in either machine, and both function 100% with my old two remotes.

I now have a second used Remote that has the same issue and is running the same version as the first used one I just got (V3.2.17)
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The Firmware Update program will sometimes read the Remote's version and acknowledge the version it intends to update to (V3.10.5). But, it gets stuck on "Downloading Firmware".

I am running the Firmware Updater from the XP Virtual Mode. The 3.10.5 Firmware Updater is dated 4/7/2006.