If you ever need to get the photos off an EOS you will need the WIA driver from cannon which is easy to get here, just enter your camera type etc. You will also need the EOS Utility, which is also avaliable from the same site as an 'update'. However this update contains the full application, but checks that you had the original installed. To force the 'update' to install the program simply add the following text to the registry (save as a .reg file using notepad then right click and choose merge).
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Canon\EOS Utility]