Well, I downloaded RetroArch and got several cores for NES, SNES, and N64 which all work perfect. The only core I seen for PS1 was Mednafen PSX which I got as well. This one, however, is not working for me. I went to get another PS1 game to just make sure it wasn't with the one ISO. I get an error as below when I try to run the games through LaunchBox:
I made sure that my BIOS files are located in ..\RetroArch\System\ and I even looked in the Emulator settings within LaunchBox where I had to add the .dll file as an Associated Platform.
Now I do remember accidentally deleting a Microsoft Visual C++ Redistribution so one of these may be missing. Below is an image of the ones I do have to hopefully help troubleshoot that possibility.
I must say, however, that I do enjoy RetroArch. Thanks for introducing it!