Click image for larger version

On a Win8 Professional 64-bit version this tampering error comes up when trying to run a Corel program. I have only seen this particular error once before on a Win7 PC that was using CA Antivirus and I had to add my programs to CA's "trusted list". However, on this Win8 PC there is no antivirus other than the Windows Defender so I have no clue what this error is about. My friend Google didn't help me much either so I'm hoping someone can shed some light on this. Thanks in advance!