@loubylou1983 I'm not sure how reliable speccy is, but 127º F would be a normal motherboard temperature. You can try hwinfo instead, if you want. (It's also free.) While you're at it, be sure to check CPU and GPU temps as well.
Since the sims you've been playing with weren't present, maybe you didn't move over the save that's been crashing. You can copy all your saves over to the new folder if you want, but definitely copy and paste, rather than dragging and dropping, just so you have backups in case you need them. If the formerly crashing save runs well in the new folder, then the issue is most likely mods or custom content, although there are other possibilities.
You can test your mods and cc in batches in the new folder—use the same save that's been crashing, for consistency's sake. Any batch that causes another crash needs to be split and tested until you find the problem file(s). Any batch that doesn't cause a crash can be set aside as presumably clean.
If the problem save crashes even before you've moved over any mods or cc, then the save itself may be corrupted. You can try playing a different sim family for a few sim-hours, again with no mods or cc present, and then switch back to the original. Or you can try recovering a backup save, if you have one from before the issues started:
https://sims4.crinrict.com/eng/2014/09/save-games/#wann
The reason I suggested running DISM and sfc (how did those go?) is because the errors in your dxdiag don't mention Sims 4, but most of them do reference basic Windows processes. A couple also mention MSI software that would probably be active while you play. So the crashes could be caused by something in the background that's not working correctly or doesn't get along with Sims 4, not the game itself. That's less likely given that playing in the clean folder went well, but it's still worth running the commands for the overall health of your computer.
Your hardware is fine for Sims 4—it should be able to run all packs together on ultra settings. That doesn't mean there's nothing wrong with your computer, just that this isn't a case of one pack or another being too demanding, or the graphics settings being too high. Sometimes it takes a while to figure out the source of the problem.