I would recommend instead following the directions I posted in the other thread regarding this problem, since the directions above, while they do install the drivers, do not actually install the software.
Step one: Unplug your camera.
Step two: Download the Vista x64 drivers from
here.
Step three: Right click on the drivers, set the compatibility mode to Vista, and run as Administrator.
Step four: Install these drivers, making sure to uncheck the download updates.
Step five: Allow them to reboot the PC. You will now have an older version of the drivers running. Plug in your camera, and click skip if it is on a step trying to find it, since it wont. Step up the camera.
Step six: unplug the camera and right click on the Quickcam software and choose to update it.
Step seven: proceed to the update, and after it looks like the process is stalled bring up task manager with CTRL+ALT+DEL.
Step eight.: Kill LVpRS64h.exe as well as the other logitech service.
This will allow the installer to finish, it has an issue stopping the service properly on its own.
So that is the main problem that needs to be addressed by Logitech. Their installer currently is unable to properly stop or kill the running service, so it halts the installation. If you do it manually it will continue without a problem.
Done. You now have the latest version of the Quickcam Pro software running on Windows 7 x64 build 7000.