Please try the following:
1. Open sed and create a new empty script.
2. Paste the follwing code into your empty script:
Code:
#include "acknex.h"
void main()
{
  printf("It's working! :-)");
}

3. Save the script on your desktop (or somewhere else you get fast access to) under the name "test.c". Make sure you select .c file as extension under the file name in the save dialog and type the .c at the end of the file name additionally.
4. Click the gears icon to go to the preferences.
5. Select the file test.c that you have just created as "File to run / publish".
6. Check the checkbox that says diag. After cheking it there should be "-diag" under command line options.
7. Close the dialog with the ok button.
8. Hit the black triangle in the top toolbar to launch the engine.
9. There should be a message box popping up. (If it doesn't there is something wrong. Just continue with 10. We'll try to fix that...)
10. Go to your desktop or whereever you saved the file and look for a file "acklog.txt".
11. Post the content of this file in this thread.

Always learn from history, to be sure you make the same mistakes again...