Well... after installing the AMD drivers and then the nVidia drivers that came with my video card, it's running peachy smooth now. How did I do this?
First thing first, I installed Drive Cleaner Pro (2+) and the AMD drivers for dual core XP.
I Then:
a) Went into control panel - Add/Remove Programs.
b) Uninstalled current nVidia Driver
c) Rebooted into Safe Mode
d) Ran Drive Cleaner Pro and uninstalled nVidia and nVidia WDM
e) In the view options for Explorer, unchecked hide system files and hidden folders
f) Did a search for nv*.dll and "Nvidia display" in the 'search for text in files' inside of C:\Windows
g) Deleted any additional files I saw
h) Popped in the OEM driver disk from nVidia video card (did not install anything here)
f) Rebooted machine
g) When it found my video card, pointed it to the drivers on the CD. Selected the correct video driver
h) Rebooted
Presto. Been playing AH for a few hours with no spinning clipboard or lockups. Getting a sold 60fps in all maps and modes. Gonna try 512 textures then 1024. Hopefully all will be good!