If you had got your Radeon X1550 unit without any RADEON X1900 driver CD or the latter is lost, you may choose to follow the links below. Without a special Radeon X1550 driver to your unit, you won’t be able to use all its ATI functionality. The basic RADEON X1900 driver from Windows is only able to support the minimum 53KY CEPRO5 set thereof. You are really in need of a fully-featured authentic RADEON X1900 driver.
For Radeon X1550 download, please just follow the IdeaPad U330 link.