This tripped a few people up (including me). Basically go to Start-->Control Panel-->System
Click on the ADVANCED tab and then, on the bottom, choose ENVIRONMENTAL VARIABLES.
On the bottom, scroll down until you see the system variable "PATH". Highlight it (single click) and hit EDIT.
Now, separating with a semicolon, add the full path that leads to your UltraMapper software (usually C:\Program Files\UltraMap). My "Path Variable" looks like this when all is said and done:
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\QuickTime\QTSystem\;C:\Program Files\UltraMap