EOS 5D Mark II fails to connect (Code 43) but 5D Mark III connects fine!

For a number of years before yesterday, I have tethered my 5D Mark II to my Dell Studio 1735 via a 5 meter long USB cable without a single problem. Laptop runs Windows 7 32-bits. Then yesterday, I tripped on the cable and slightly bent the mini USB connector. Nothing was broken as the cable continues to function but as soon as I turned off the camera to change a lens, from that point onwards, it's nothing but the following ...

Currently, this hardware device is not connected to the computer. (Code 45)
Port_#0001.Hub_#0004

... I've tried every tip on the web to no avail - including resetting the laptop, taking out the battery and leaving it for 10-30 minutes. I've even left it overnight and no help either. I've uninstalled USB ports etc I just don't know what to do any more and being able to review images on the laptop is critical to my work.It's only the 5D Mark II that's having problems .. all other USB devices connect and disconnect without a hitch.

I have 2 5D Mark II and both cameras trip the same error even when I use a different USB cable.

Help!

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JAN SHIM
http://www.shimworld.com
http://www.facebook.com/janshimphoto