Another approach is to use the full path to the command when using it so the OS doesn't need to look on the PATH for it.
On some OSes you could write a script or batchfile that has the full path in it.
Since I only have WinXP I have no idea of where to go to set Environment variables on Windows 7.
I click Start button, choose Settings, choose Control Panel, choose System, click Advanced tab and then click Environment Variables. Then I can add to PATH.
More or less same for Windows 7. As long you are Windows user with reasonable knowledge of OS you wouldn't have problem to figure that little differences. (Accessing control panel and navigation differ, but that is really just minor detail)