Data Execution Protection (DEP) is a windows feature that can prevent Essential FTIR from running.

Here is a link to a Microsoft site that explains how to turn it off (for Windows Vista, but other Windows operating systems are similar).

http://windows.microsoft.com/en-us/windows-vista/Change-Data-Execution-Prevention-settings

For Windows XP, follow these instructions:

  1. Click Start
  2. Select Control Panel
  3. Select System
  4. Click the Advanced tab
  5. In the Performance region select Settings
  6. Click the Data Execute tab in the dialog box that opens
  7. Select Turn on DEP for all programs and services except for those I select
  8. Click Add.
  9. The open dialog box will open. Browse and select Essential FTIR, which is usually installed at "C:\Program Files\EssentialFTIR\eftir.exe".
  10. Click Open
  11. Click Apply
  12. Click Ok
  13. Reboot