I try to change the quality under settings then it tells me that some app may stop working if I change the setting from telephone quality to dvd and I press apply and it goes right back to telephone quality
My thought is that "stop working" in your situation simply ends up being reverting to the lower quality ,telephone audio. Likely due to some hardware or software limitation. Reverts versus a crash, screen lockup, BSOD, etc.
Have you tried downloading, reinstalling, and reconfiguring any applicable drivers?
Three immediate suggestions:
1) Update your post to include hardware specs and OS with respect to the audio system/setup.
2) Add more details about the software and apps affected.
3) If you have a Windows system look in Reliability History/Management. There may be some error code, warning, or even an informational event that regarding the change back to telephone quality.