Windows vista is not supported for RX4xx cards.Try to install driver manually via device manager ( search on your install disc or in C:/AMD folder if you want to try latest driver for win7 x64(if normal installation of this driver will give you an error )).
Thank you all for a reply. I went ahead and started instaling windows7 and
upgrade a bit and be able to use my new cool video card....may not be much
to others, but me being broke most of the time, this is the best i've had
yet. Good Luck to you all, and thank you.
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The 4xx series are not supported with vista, no drivers are supplied for that version.