hi, i have seen that same error myself, you need windows media dual boots with x64 bit drivers -anything that needs a driver in the 32 bit installation just fine, will need a 64 bit driver in it's installation. you should go to the ATI site. do it , it should help you.
THIS is probably a message from your monitor,
Some monitors may display that message when the monitor is on butor when the computer isn't producing any video.
This error usually appears when the video settings in windows are not supported by the monitor. For example, if monitor does not support large resolutions and you set a large resolution in windows, you get this message.
The current video settings are not supported by the monitor. This could be that the color bit-rate is unsupported, the pixel resolution is too high or low, or the connection from the computer to the monitor is not correct.