I just tried connecting my cameras (5DC and 350D) for the first time to this laptop. The EOS utility will not recognize them. The closest I got was with the 350D in print mode for communication where the computer recognized the model and said to switch communication settings. The 5D doesn't seem to connect at all.
I never had this problem on the old laptop Vista 64 system. I am now on a Windows 7 64 system. I have tried reinstalling an older version of EOS utility (version 2.3 from the Canon CD), and still have had no luck. I have also tried running the software in Vista 64 compatibility mode.
I'm guessing this is more of an issue with the laptop then the Canon software. I've used Zoom browser and DPP quite a bit. As I have always used a memory card reader on this computer, I have been unaware of the problem.
Please post some suggestions as I'm stumped at the moment.