Do you mean that you are trying to use the WIN 2k server as the authentication server ?? If so that is NOT supported for LEAP you need to use ACS or Steel belted Radius by Funk or interlinks radius server the minimum versions can be found in the release notes for the AP
If you are trying to have the win 2k server authenticate as a client then it must have a Cisco client card installed and you need to use ACU, when you install ACU there is an option to install LEAP.
The hot fixes can be found on the Microsoft website but I am pretty sure they have been intergrated into the latest service pack