Win7 Drivers for old Logitech webcams
Go find the below software packages on the web. Do NOT attempt to run the executables. Use something like 7zip to extract the files into a folder by the same name as the executable. Then just install the drivers for the unknown device that has shown up in the device manager when you plug the old webcam into your Win7 machine.
quickcam_11.9.0.1263.exe
quickcam_11.9.0.1263_x64.exe
I have an upgraded acer aspire running Win 7 Pro. It came with Vista. The camera works fine on an XP machine using the current version of the software for that machine. The same camera moved to the aspire works fine in Skype and variations of MS Messenger which support video cameras.
Reminder, do not attempt to install these packages. Only go into the extracted folders to the driver section. My driver for my Logtitech webcam model IM (the aspire has a 64 bit processor) was in the folder QuickCam_11.90.1263x64\drivers\x64\IM264
You will get error message from Windows 7 complaining about the driver not being correct, blah, blah, blah. You may not select the right driver the first time either. You will need to reset the computer after installing the driver to get it to work. If it is the wrong driver, Skype will not open the camera but give you some error message. As they say in Japanese manuals translated into English "Not to worry" try, try again.
Note that these drivers are NOT available directly on any Logitech web site but can only be obtained using the Logitech Utility Updater that is included with earlier versions of QuickCam drivers. You can only obtain them from Logitech if you are installing over the drivers QuickCam 11.7 or 11.8 already installed, which of course you cannot do in Win7. Fortunately, a web search will quickly find the drivers available from various sources. Naturally, Logitech does not offer these drivers on their FTP site and naturally, Logitech tells you that the early webcams are not Win 7 compatible. Hah! and Hah! again!
If this does not work for you, I doubt if you can get any support from Logitech and I do not guarantee that the software Gestapo will not come stomping into your location!