I removed a post that included a link to the poster's own web site. The rest of his post is copied below;
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Check this out - New!
by MyPersonalTechAdvisor - 28/10/09 11:52 In reply to: Logitec Pro 4000 by stormsniper

Look at the last post on this thread:
http://forums.logitech.com/t5/Windows-7-Discussion-Topics/quickcam-pro-4000-driver/m-p/371399/message-uid/371399

It looks like the guy said he followed the instructions earlier in the thread and got his QuickCam Pro 4000 working on Windows 7 64bit.

Good luck!

--
Jesse
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MarkFlax