Hi,
Refer to the following link, this might help you.
Update a driver for hardware that isn't working properly.
You can refer to these steps to update monitor driver from the device manager.
- In Windows 7 and Vista, click Start , type Device Manager in the search box, and select Device Manager from the menu.
- If prompted with a User Account Control message, click Continue.
- In Windows XP, click Start, right-click My Computer, click Properties, click the Hardware tab, and then click Device Manager.
- Click the plus sign (+ ) next to Monitors, and then double-click the name for the monitor (Generic PnP Monitor or similar) .
Generic PnP Monitor listing in Device Manager
- Click the Driver tab, and then click the Update Driver button.
- Select Search automatically for updated driver software to have Windows search the computer and the Internet for the latest driver software.
Hope this helps.