Just a followup.
My old system has AH on the C drive with Windows 98.
The new system has XP on the E drive, which is where AH installed to. (There's a C partition with Win98/DOS, and a D with Data).
I just made sure the old computer had the latest AH patch, installed the most recent download on the new PC, and the copied the aforementioned folders over.
I had to recalibrate the stick and change the video settings for the new video card, but that was pretty much it.
I played for two hours last night, and it was fast and smooth, and no crashes to the desktop at all.
Even the 9 year old Thrustmaster FLCS, WCS Mark II, and CH Pedals, all running though the gameport on the Audigy LS, were working great. And this is a P4 @ 3 GHz running XP even.
Thanks for the tips.
-Llama