Download the Vista 32 or 64bit version of the software for the device. Then use WinRAR or similar and extract the exe to a folder. Within the folder you should have a bunch of folders and files. Try running the 'setup.exe' in compatibility mode for Vista. You will likely get an error or two but it should work, as it did for my QC4000.
If you just want the cam to work and don't use the software itself then you can go into Device Manager and 'Imaging Devices'. The cam should be listed there, then you can choose to 'Update device..' and point Windows to the folder you already extracted earlier, specifically the 'Drivers' folder. The cam may not be listed under 'Imaging Devices' but rather under 'Unknown Devices'. This also worked for my QC4000 when I simply wanted cam functionality without the software.
Hope this helps
I knew that. I actually copied the temporary files from C:\Users\<UserName>\AppData\Local\Temp\Logitech_Webcam_1.00.1280 into C:\Logitech_Webcam_1.00.1280 and then execute the SETUP.EXE. When the setup asked me to plug in my QuickCam Pro 5000, I found that it CANNOT detect QCPro 5000 even though I have already plugged it into a USB port, so I ended up skip the checking of the QCPro 5000 and install the Logitech Vid software & QCPro 5000 drivers anyway.
Then I found there is an Unknown Device in the Device Manager and I try to update the drivers and point the path to each of the following:
C:\Logitech_Webcam_1.00.1280\Drivers\x64\ELCH64
C:\Logitech_Webcam_1.00.1280\Drivers\x64\IM264
C:\Logitech_Webcam_1.00.1280\Drivers\x64\PRO564
but Windows 7 said it cannot found any drivers. I was finally able to successfully install the QCPro 5000 drivers by selecting the "Browse my computer for driver software" and then select "Let me pick from a list of device drivers from my computer".
Unfortunately, it turns out that my WebCam is not working even though the driver said "installation ok". And when I perform a reboot, I got a very first BLUE screen of Windows 7 due to the WebCam driver crashed my Windows ! I have to roll back to a previous restore point afterwards.
After I have restore my Windows 7 to a previous restore point, I found that the Windows Update have found an optional QCPro 5000 drivers for installation ! I installed it from Windows Update and it "seems" to be ok. Since the driver did not come with the Logitec Vid software, so I cannot verify whether the WebCam driver is working properly.
Lastly, I re-install the Logitech Vid software from C:\Logitech_Webcam_1.00.1280\ folder and this time everything works fine. I can use Logitech Vid to open my WebCam !