I have seen this problem before and Canon informs me that it is a problem with the Microsoft driver. My new EOS 600D does not Autoplay when connected to my PC running Win 7 64-bit. The Autoplay function is set up correctly and all other devices and cameras work perfectly. It seems to be a problem for most Canon cameras but is only intermittent. I have noticed that Canon cameras act differently to other cameras and USB devices when connected by USB. When you right-click on other cameras (even quite old models) in the device page, you are given an Autoplay option. This is not the case with Canon (even when they do autoplay on connection). The only effective solution that I have seen is to wipe the hard drive and do a clean instal (a repair instal did not work for me).
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I had a response from from a second level technical support person at Canon who said: 'I have had a few instances of this before. Autorun seems not to launch on Windows 7 64 only. I appreciate that this problem does not exist with other camera manufacturers, however please be advised that the basic camera and USB drivers are provided by Microsoft. There is no decision made by Canon to purposefully cause this problem. There is clearly something fundamentally different in the way that the computer recognises the camera, but this is something that should be addressed by Microsoft. As this issue has been highlighted before, please be assured that Canon Inc may well have already informed Microsoft of this problem.' I hope it is correct that Microsoft are looking at the issue.