See if there are any errors in Device Manager.
To view an error code, open the Device Manager (right-click My Computer Properties Hardware tab Device Manager) and double-click the name of a device with a yellow exclamation point (!) or a red X superimposed on the icon at the left of the device name. The Properties window for each device driver includes several tabs. If an error condition applies to this device, the Device Status section of the General tab contains an Error Code and message.
To view an error code, open the Device Manager (right-click My Computer Properties Hardware tab Device Manager) and double-click the name of a device with a yellow exclamation point (!) or a red X superimposed on the icon at the left of the device name. The Properties window for each device driver includes several tabs. If an error condition applies to this device, the Device Status section of the General tab contains an Error Code and message.