I don't have autocad 2000 here, but i can tell you autocad 2002 works fine.

taken from autodesk support
 
Issue
 
When you try to run Autodesk products that are locked using the Ç-Dilla based security system on Microsoft Windows; XP, you receive the following warning message:
 
Cdilla CDSecure. This version of CDSecure is not compatible with this version of Windows.
 
If you attempt to run the program, license errors are subsequently displayed and the product does not start.
 
 
 
Solution
 
The updated runtime system (RTS) version 3.24.000 is required to run software-locked Autodesk products on Windows XP. Download the file at the Autodesk Product Support website.
 
rts324000.exe
 
Only software-locked Autodesk products require this update. The versions of the products using FLEXlm license manager technology do not require the updated RTS.

so???
 
Did that fix work?
 
Just curious as my roomie is in CAD and uses auto cad alot

just installed autocad 2000.
Start>programs>accessories>Program Compatibility Wizard
follow the instructions.
You want it for the the CD and it will autodetect the file. Run it as windows2000 compatibility mode

even better!!!
 
I didnt even think of that