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With 2 of the crashes the Nvidia Streamer Service was active, this service is known for system freezes, performance issues and BSOD's.
Please try the following
- Search msconfig and open it
- Go to the tab services
- Check 'Hide Microsoft services'
- Search Nvidia Streamer Service and uncheck it
- Click apply > ok
- Reboot if asked
The first BSOD was caused by a driver from Realtek HD Audio, but I cannot find this driver or an audio device from Realtek.
Please go to C:\Windows\System32\drivers\ in explorer and search for "RTKVHD64.sys" (without quotes). If you can find this driver, right click it and choose properties, go to the tab details, make a screenshot of it and post the screenshot.
5: kd> lmvm RTKVHD64
start end module name
fffff800`49180000 fffff800`495fd000 RTKVHD64 T (no symbols)
Loaded symbol image file: RTKVHD64.sys
Image path: \SystemRoot\system32\drivers\RTKVHD64.sys
Image name: RTKVHD64.sys
Timestamp: Tue Jun 02 12:47:59 2015 (556D89DF)
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4