Installation went well enough, but I too got the message "unable to start up 3D acceleration". I am using an ATI Radeon 9200.
Fortunately, I've gotten past that problem and am now downloading the WoW patches. The solution for me was to run WoW.exe directly rather than through the menu. For example, my desktop launcher runs:
"/home/me/.cxgames/win2000/drive_c/Program Files/World of Warcraft/WoW.exe"
instead of the icon crossover put there which was set to:
"/home/me/.cxgames/win2000/desktopdata/cxmenu/Desktop.c^5E3A^5Fwindows^5Fprofiles^5FAll^2BUsers^5FDesktop/World+of+Warcraft"
--B