Well, thanks to Nubius and everyone who helped me. I got my card and put it in... And well, I'm here!
However, there is a slight problem...
I put the drivers on and I was all excited about testing the new card. So I slam in RIse of nations, double click the icon and BAM.... Computer reboots.
Tried a few times. It reboots every time, scans the disks, and then sometimes displays this message saying the computer recovered from a serious error.
In fact, it originally did it as soon as I booted up Windows, but now it boots up fine.
Does anyone know what could be causing this? Apparently the system is saving itself from something... But what? Thanks!