I read your 5 most recent minidumps and they all report the same error code 0xD1. These are usually caused by faulty drivers.
All five report the cause of your crashes as the driver viahduaa.sys which is a VIA High Definition Auduio driver. I am assuming you have onboard audio.
Go to your motherboard manufacture's website, find the exact model of your motherboard (or if this is a pre-built go to their website and find your PC model) and download updated drivers for your system, especially for the onboard audio.