Getting my video card back

Hi There,

I have a Vostro 200 Slim, which I've had for about two years.  After two years, things were getting a bit encumbered, so I wiped it this weekend, and reinstalled Windows XP.  I was able to restore everything except for the graphics card.  I bought it with a 256MB ATI RADEON 2400XT graphics card factory installed, and I have been running dual screens.

1)After reinstall, when I booted up, neither screen was showing anything.

2)Eventually, I rebooted, with one of the screens plugged into the orginal VGA slot that was built into the computer, but to this point never used.

3)This caused a warning message to come up during bootup (while in bios, well before windows) warning that I was using an unsupported graphics driver, and shoudl really plug into the other card.  ignorning this message brought up windows on the one screen that was plugged in.

4)I have my RADEON drivers disk, and installed the drivers

SO:

a)no matter how I install the dirvers, they won't show up on the add/remove progams list (they were listed there before the reset)

b)If I boot up with the monitor plugged into the default plug, I can't get Systems or Hardware, or anywhere to acknowledge the existence of the RADEON card

c)If I boot up without the monitor plugged into the default plug, I don't get the warning screen, but I don't get any screen at all, even if I go back after boot up, and plug into the default plug.

How can I get it to realize there's a nicer graphics card in there?  What am I missing?  I've been able to entirely restore every other aspect of the machine, but this bit has me stumped.

Thanks,

Joel Skaliotis