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go to control panel/system security/system/device manager. on the top scan driver click it... if you see an icon camera with yellow sign (like this ?) click it and install update online... automatic online downloading... step by step ...
Re-install the driver for the webcam.
Follow these steps to re-install the driver for the webcam. You will
need to be logged in as an Administrator or have an Administrator
1. Click the Windows Start
2. Click Control Panel, System
and Maintenance and then Device Manager.
3. Right-click on Chicony USB
2.0 Camera and select Update Driver Software.
A yellow exclamation point indicates that the camera is recognized by
Windows but is not working properly, probably because of problem with
the device driver
4. Select Browse my computer
for the driver software.
5. Select Let me pick from a
list of device drivers on my computer.
6. Select USB Video Device
from the list, and click Next.
7. If the message “Windows
encountered a problem installing the driver software for your device”
appears, click Close.
8. Restart Windows.
The webcam should now work properly.
I'm using a Toshiba satellite notebook A200, which I faced the same problem like you saying my built- in webcam cannot operate after I clicked on the drop down list from the windows live messenger to have a webcam conversation. Another program is running the webcam at startup. That program is called Camera Assistant Software which is the conflicting software. Therefore I closed this software and I'm able to use my webcam again in my webcam conversation in windows live messenger. I hope this information will help you.Good Luck!