VGA Driver Issue or DirectX 9.0c Corrupted

Do you think you guy's could help me?

I'll preface this by saying that I have 5 computers total. 1 with Vista, 2 IBM thinkpad R51 laptops (XP), and 1 Dell Optiplex 170L (XP), and 1 Dell Optiplex GX270 (XP).

The problem is with 1 of the laptops and the GX270.

When I run dxdiag for both computers and click on the 'Display' tab, DirectDraw, Direct3D, and AGP texture acceleration are all "greyed out" and disabled, unable to be enabled. Also, where it says "Approx. Total Memory" in the same tab, it says "n/a." The VDD and DDI version are also "n/a" or unknown. The thinkpad has a Radeon 9000 Mobile, and the GX270 has an AGP Geforce MX460 that I can swap out with an AGP Geforce FX 5200, or a PCI Radeon 9250.

However my other three computers do not have this problem. DirectDraw, Direct3D, and AGP texture acceleration are all enabled, and anything they can run, they do. The laptop's card is the same, the 170L's graphics card is a Geforce 6200 PCIe, and the Vista computer is almost irrelevent, but it works.

I've reinstalled drivers, attempted to install Directx 9.0c again unsuccessfully, disabled "remote desktop sharing", restarted with a clean boot sequence, and even made them both nice, warm hot chocolates... but nuthin doin...

I'm just trying to get a few programs to run on all of them over the network, but right now only 3 work.