Thanks, I found the same information too, but it didn't work for me. I realized that my PID is different (08B6) and when I made some changes, my camera finally worked;
1) Downloaded QuickCam 10.5 for Vista x64.
2) From a non-Windows 7 PC (or from XP Mode), run the installer. Let it extract all of the files, and DO NOT PROCEED through the installation process (or if it errors, keep the error message open). Go to the Temp folder where the files were extracted. COPY (don't Move) this folder to a location that's accessible to your Windows 7 system.
3a) Here, after locating the folder, you have two folders, PRO64 and PRO364 but you have tu use "...Drivers\x64\PRO64" and edit the lPRO64v.inf file. Do a find-and-replace, finding 08B2 and replacing it with 08B6 (this file you identify your Cisco VT device ID as a QCP 4000). Save and close the inf file.
3b) Go into Devices and Printers. Go into the properties for the USB Composite Device, find the Unknown Composite Device, and update the driver. Select to manually specify the driver location. Point it to the \Drivers\x64\PRO64 folder, and you should be all set.
My Cisco VT Camera
LP/N: 861159-1000
It works. I have Win 7 32 bit and have downloaded "QuickCam® Pro 4000" Vista drivers from Logitech, followed the instructions (although in my case the path is "C:\Program Files\Logitech\QuickCamWebInstall\Drivers\x32\PRO" and edited all the .inf files (08CE with 08C7) just to be sure 
