Re: Probem with connecting projector with laptop in vista...
You need to change your graphics card settings from extended desktop to cloned desktop. You will find that if you use your mouse currently to drag a window or icon across to the projected screen, it will move the window there. This is the extended desktop. I assume that what you want is to have the exact same screen on your laptop and your projector - this is called the clone screen. These setting can be by right clicking your desktop, select properties. Click on the display settings tab. click on the advanced settings button, and the the graphics card tab. There should be another button to launch the graphics card settings there.
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Check the Microsoft knowledge base for a "workaround" for this issue. Try doing a search for "device not recognized" there should be several steps to correct this issue. However this may be due to compatibility with your projector and the usb port drivers. Contact the manufacturer or go to his website for driver and usb information on your Projector ability to connect to your Acer. Good luck!
When the projector displays the background image and the lcd displays the desktop as normal you can drag the open windows to the left or right and display them on the projector. it sounds like this laptop has an internal video card. If you right click on the desktop it might give you options to configure the display settings for the video card. Not sure how you will get to it if it does not show up on the right click menu. Probably through the start menu or in the control panel there should be somewhere to change the settings for the video card. This will no be under the display settings though.
But once you find your dual display options you will be able to change it to make both displays the same
on your display properties, switch windows to appear on your laptop. and do not connect your LCD when booting your PC. there is an option in display property that says extened your windows to this display... that is your LCD.