When installing, did you turn off/disable your Anti Virus program, and run the installer using "Run as administrator" (right click on the installer and select it from the list that pops up)?
After you finish installing using the above method, and hopefully the ace_757.exe gets installed, you might need to add FSX/FSX-SE/P3D to the exclusions list in your AV program, as it might believe that the ace_757.exe is virus or trojan, when it is not.