Several ideas...good luck...
It may be worth a try to change the camera settings from
WIA to PTP.
Maybe the following documentation would be useful:
Setting The Communication Mode
(Notes on the PTP Function)
http://www.usa.canon.com/app/pdf/d_eos/10D_PTP.pdf
===
Did Canon Support ask you to run the following Wizard?
Download the Microsoft Autoplay Repair Wizard:
http://www.microsoft.com/download/en/details.aspx?DisplayLang=en&id=2648
===
Also...go to...Start / Computer...and right click the Removable
Disk that represents the Camera and from the menu...choose...
Properties / Autoplay tab and open the drop window and select
Pictures. And...tick...'Prompt me each time to choose an action'.
Maybe this will restore the Autoplay window when you connect
the camera..
Also you could try...left clicking the "Restore Defaults" button /
Apply / OK.
===
Simple fix may be to purchase an internal or external USB
Media Reader. Then just remove the memory card from the
camera, insert it in the reader and download your photos.
There can be other benefits to this method...for one it won't
drain your camera batteries while downloading and may
even be faster.
===
And...FWIW...low camera batteries when downloading can
cause corrupt photos.
Also you could try the following steps with a camera connected
by USB or with a USB media reader.
Connect the camera to your PC via USB cable and turn
on the camera...if any windows open...close them.
Next...go to...Start / My Computer...the camera may be
listed as a drive letter....
If_yes_right click the drive letter and choose...Explore or
Open...this should display the directory of the memory card.
You can copy/paste or drag/drop the files from there to a
folder on your hard drive.
(The same steps will work if you have a Media Reader...
when you go to...Start / My Computer...the slots of the Media
Reader should be listed as...'Removable Disk' with a drive
letter.)