I replied a couple of hours ago, but forgot that you were on a Windows machine, not a Mac...so hopefully you didn't waste time reading my initial response. Anyway, have you installed the most recent version of the drivers for that camera (
http://www.microsoft.com/hardware/en-us/p/lifecam-cinema#support )? And are those drivers compatible with Windows 64-bit? Also, have you installed all Windows updates? Is the camera plugged directly into a USB port on the computer (not a USB extender cable or USB hub)? Have you tried rebooting the computer with the camera attached?
If the answer to all of the above questions is yes, what software did you use to test the camera with (Skype, etc) to make sure that the system detects and can display the video feed from the camera? Did it show up in the dropdown list for the program that you tested with?