When you try to start a program that must run with elevated permissions on a Windows Vista-based computer, you may receive an error message that resembles the following:

The directory name is invalid.

This issue occurs if the following conditions are true:

• User Access Control (UAC) is enabled.
• The system Temp folder does not exist.
  Note: Typically, the system Temp folder resides in the following location

  %windir%\Temp directory