Most games crashing shortly after start

[Overmind87]

Help! I don't know what caused it, but recently, most of my games started crashing shortly after I start them up. Most will start, show whatever the first screen is (like the "Please Stand By" screen on Fallout 3), the boot me back to the desktop while an error message comes up saying "*game* has stopped working." A lot of the games don't even get past the little splash screen they show before they start, like Arkham Origins, before the message comes up. Not all of my games crash (Dark Souls 2, WatchDogs and Tomb Raider, to name a few), but most of them do. I tried updating DirectX, updating my graphics drivers, rolling back my graphics drivers, even tried doing a repair install of windows 7, which failed for some reason. I don't know what else to do. Has anyone run into this problem before and was able to fix it?

GTX 780 Classified
Core i5-4670k
16 GB RAM
840 EVO SSD
Asus Maximus Impact VII MoBo

 

[spooky2th]

Make sure your power computer settings are set all the way up. If still crashing, check out your memory speed and timings & voltage. Make sure everything is set correctly.

 

[Overmind87]

Make sure your power computer settings are set all the way up. If still crashing, check out your memory speed and timings & voltage. Make sure everything is set correctly.

Everything seems to be in order. Besides, if it was a memory issue, would that affect the entire system instead of just the games, or at the very least affect ALL the games?

 

[spooky2th]

If the memory timings and speed were not correct, memory intensive programs and/or games would have problems.

 

[Overmind87]

If the memory timings and speed were not correct, memory intensive programs and/or games would have problems.

I checked the BIOS to make sure nothing was overclocked and that the memory settings were all set to the manufacturer's specs. Everything is set properly, but I'm still experiencing crashes, so that tells me the hardware is probably not the problem.

 

[spooky2th]

If bios & memory set right, after optimized defaults were first set, I would start looking at the PSU. What PSU do you have?

I have my power settings (not in bios) at "Ultra Performance."