Aw, Mark hadn't you realised he's one of those Microsoft loving trolls that sadly infect too many places on the net these days.
Anyway, You gotta love his creative mind tho - a work PC with three video cards ( AGP and PCI!) and five monitors. Yeah, right.
Oh, and Power, in the unlikely event you are telling the truth and not just recycling a problem pulled from an ancient forum archive, the system is taking the safe option of setting the video system to SVGA as it doesn't recognise the card / monitor. Perhaps you could try pressing the administrator button, at the bottom right hand of the locked dialog, and supplying your user password. This will allow you to mess with the settings all you want. Just make sure you know what resolution / refresh rates / colour depths the card / monitor combination do actually support ...