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 * New - Windows® 7 Tips, Help & Information

XP - Check Computer devices for errors.
Right click on "My Computer," select Properties, then Hardware, then Device Manager. (Or: click to Start/My Computer/View system information/Hardware/Device Manager.) You should see no items flagged with the yellow exclamation marks or red Xs that indicate trouble.
Still inside Device Manager, click on View/Show hidden devices. A red X in a hidden device may or may not indicate a problem (some hidden devices may be disabled deliberately, because they aren't needed). If a problem is found you may want to right click the item and select uninstall. Reboot and it should install itself or you may need to update the driver.