EAccess violation when i start the built in web cam Eaccess violation will appear on the screen.

Normal 0 Probably has corrupt driver.
Try disconnecting the Camera from the USB port and reinstall the CD or Downloaded software program. When the program asks you to connect the camera to the USB port, do so and it should work.
Then to use it on the Web do this.
Web Camera’s have to be setup on the program they are to be used with. Just installing the camera on your computer does not set it up to broadcast on messengers or Skype.
Each program has Options that have to be setup in order for the Audio and Video to function properly.
A. Skype Setup:
After downloading and installing Skype (http://www.skype.com/intl/en-gb/download/skype/windows/beta/downloading/ ) set it up as follows:

1. Go to Tools, then Options, and click on Audio Settings and set the Microphone and Speakers to the computer Audio Card.
2. Then click on the Video Settings.
3. The camera if Installed Properly will come up and show a video picture.
4. Then, on the bottom of the page click on Save.

The camera and audio should function properly. Your friends and Family will now be able to see and her to you.
B. Yahoo Setup:
After downloading and installing Yahoo Messenger (http://www.soft32.com/download_30.html ) set it up as follows:

1. Go to Messenger at the top left and click on it.
2. Next go down to Preferences and click on it.
3. Next Calling and Devices on the right and set the Microphone and Speakers to the computer Audio Card.
4. Next go to the Test Audio section and (in blue writing) click on “Open the call setup assistant” and follow the instructions on the left window.

C. Windows Live Messenger:

1. After you start Windows Live Messenger, expand the view by clicking on the square on top left next to the red X.
2. Then on the Windows Live messenger window on the right side, click on “ “Show Menus.” And then click on “Show the Menu Bar”.
3. Next go to the Menu Bar on right side, click on “ “Action.”
4. Go to “TOOLS” and click “Audio and Video Setting” and follow the instructions.

NOTE: Your audio and video should work. Enjoy.
When done both the Audio and Video will function properly so you can chat and see family or friends you are connected to.
Hope this helps. Bud