What does the message say? If it says Press F1 to Continue, then there is a hardware problem. Go to Start/Run and type devmgmt.msc and press enter. In the Device Manager do you see any devices with yellow marks? If so, these devices need to have drivers installed. If you have a name brand computer (HP, Dell, Gateway etc), then you can go to the manufacturers support/download drivers web site type in your make and model # and download drivers for your specific computer.