If its a brand new Gateway, my idea would be to call Gateway tech support and ask them.  Windows XP can require that you re-register if you make changes to the system, and will not run if you don't.

>Hi there, I hope someone can help with this, it's not strictly hardware but
>it is certainly hardware related.
>
>I just purchased a new Gateway PC, it's a P4 1.7Ghz and I opted to upgrade
>to the ATI Radeon VE 64MB graphics card. I am previewing Windows XP on it
>which nicely detects ALL hardware without any need for additional drivers. I
>was looking forward to some serious gaming but it refuses to run any game
>that is OpenGL related, for example;
>
>GL version of Doom2 - at start up I get a Fatal error saying "OpenGL Driver
>is not accelerated", then another saying "Unable to create main window,
>program will now end" (Normal Doom2 works fine)
>
>Quake 3 Arena "Could not load OpenGL subsystem"
>
>I would have thought with hardware so new, so fast, so fab and groovy, that
>this PC would run everything without complaint.
>
>Any ideas?
>



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