I uninstalled my acer crystal web cam by mistake how can i restore
Click Start--> right-click on computer, then click "manage" Once the Computer Management screen opens, click on "device manager" in the left-hand pane of the window. In the middle pane, there should be an icon that represents your computer, and underneath that icon will be a series of icons that represent different types of components.Click on an empty spot in the middle pane, and you should notice that the icon that represents your computer (not the one labeled "computer, the one above that) should be highlighted. If it's not, click it one time to highlight it. Then click Actions-->Scan for hardware changes.When you do this, it should detect your webcam, and launch a wizard to reinstall it. Allow it to connect to Windows Update if it asks to, so that it can search for the latest driver. But it should have a driver locally already, since you just had it installed. Once you complete that wizard, your camera should be installed again.
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