For the past week I have had huge problems when attempting to import raw files from my camera into Lightroom 3.6, using a Windows 7 operating system. As soon as I select the camera as source, Lightroom freezes and I end up having to close the program. After multiple attempts I have sometimes managed to import - today though I am completely unable. I have tried following previous threads on this issue, tried disabling certain USB controllers, to no avail, and my technical knowledge is at its limits. Any help, please?