CAD tip # 3327:

For AutoCAD 2004 (and higher) the normal user rights are enough.

From Jürgen Hiltebrandt:
Alternatively, you can try to assign Registry permissions for full access of normal users to the following Registry hives (for AutoCAD 2002):

HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk
HKEY_CLASSES_ROOT\AutoCAD.Drawing
HKEY_CLASSES_ROOT\AutoCAD.Drawing.15
HKEY_CLASSES_ROOT\CLSID\{8E75D913-3D21-11d2-85C4-080009A0C626}