But this is the issue - I asked for specifics and you don't say anything about them. It's hard to help if you don't give answers. I had asked, are you using a laptop? Do you also have on-board graphics? Could it be that both the Wicked Engine and GameGuru MAX's alpha are attempting to access your on-board graphics instead of your GTX 750 ti?
Now you say you have an aging PC. What are it's specs?
Having revisited your PMs with me, I see you have an i5 and 8GB system RAM. i5 CPUs are not bad. 8GB is not horrible, either. I doubt that either of these are causing you issues running either Wicked or the alpha. So, if you have DirectX properly installed, then what else could the problem be?
BTW - You didn't say, but did you ever bother to download the Dependencies program Lee linked to and run it? It can help to point out issues and it's what eventually led to my solution.
I'm trying to help here (and I bet others would, too). But telling us you're not a gamer and only dabble in 3D modeling is NOT going to help us help you find a solution to why either Wicked or alpha3 is not running on your system.
Intel i7-5820K 3.30GHz (overclocked to 4.5 GHz), 128 GB RAM, Nvidia GTX 1080 ti 11GB, Windows 10 64-bit, dual monitor display