My webcam works fine with everything, but when I use "Quick Capture" to take a photo, it says that the webcam was not found or is not working properly. I've tried to reinstall it several times as well. How can I fix this?

1st You download Webcam Driver.
My webcam After this install the Webcam driver in the system.
Installation of Webcam Driver
Go to the control panel
Click on the System Icon
Click on the Hardware Tab
Click on the Device Manager s
Select the Unknown Device or printer device where yellow Question Marks sign on it.
Right click on it and uninstall it.
After this go to the top of the device manager and click on scan for hardware changes.
Driver installation Wizard start.
Brows Your Driver from the Hard Disk and click on next.
Driver will be install.
Logitech Camera Drivers for Windows XP Vista Windows 7

Copy this site and paste it in your browser ADDRESS
Bar and hit ENTER;

http://www.free-codecs.com/AMCap_download.htm

to download the Free AMCAP Video Capture Program.
AMCap v9.20
AMCap is a small yet fully functional video capture application compatible with Microsoft
DirectShow. It is based on the sample AMCap from the Microsoft DirectX 9 SDK. AMCap supports
still captures to BMP, JPEG and PNG formats and it remembers your Video Input, Video Standard
and Video size settings from previous session. It has some nice features like multi-monitoring support, zooming, aspect ratio and interlacing features.
program.
AMCap is a small and effective piece of software and definitely worth trying.
Hope this will help. Bud