I'm currently running Windows 2000 Professional on my K7T Pro-2A.
Had no problems installing it.
Haven't had any problems running it, except that since I have a couple of IBM ATA/100 drives and Win2k doesn't support ATA/100 natively yet (will be fixed in SP2 for Win2k).
I had to change the drives to ATA/66 and no problems whatsoever, been solid as a rock.
So I would imagine if you have fairly common/popular that have decent Win2K drivers you shouldn't too much trouble using it.
