my dell webcam is not working

Hi,

You probably need to reload the camera drivers and any camera control software (usually included
with the drivers and installed at the same time). 

Logon as Admin.

Control Panel - Device Manager - Imaging - write down make and model of camera - double click
on it and on driver's tab get version. Now click Update Drivers (which may not do anything as MS
is far behind certifying drivers). The RIGHT CLICK on the camera - UNINSTALL - REBOOT - this
will refresh the driver stack.

Now go to System Maker's site and download the latest camera driver and other related camera
software (if no newer get the same ones).

Download - SAVE - go to them and RIGHT CLICK - RUN AS ADMIN - reboot after each driver.

Manually look at manufacturer's sites for drivers.
http://pcsupport.about.com/od/driverssupport/ht/driverdlmfgr.htm

Installing and updating drivers in 7 (updating drivers manually using the methods above is preferred
to ensure the latest drivers from System maker and Device makers are found)
http://www.sevenforums.com/tutorials/43216-installing-updating-drivers-7-a.html

Then leave windows updates on however stop it from loading drivers which are often older than the
ones you have installed. If Updates suggests a driver then HIDE it and look manually to see if their
really is a newer one (at both system maker and device maker's sites).

How To Disable Automatic Driver Installation In Windows Vista - Drivers
http://www.addictivetips.com/windows-tips/how-to-disable-automatic-driver-installation-in-windows-vista/
http://technet.microsoft.com/en-us/library/cc730606(WS.10).aspx

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Check with Dell Support, their on-line documentations and drivers (to update or re-install),
and their forums.

Dell Support
http://support.dell.com/

Dell Drivers - Product Manuals & Warranty Info (left side) - Tech Support and more
http://support.dell.com/support/index.aspx?c=us&l=en&s=dhs

Dell Forums
http://en.community.dell.com/forums/

Hope this helps.