Usually caused by driver.
The First minidump indicates csrss.exe, possible malware hiding place.
Scan using malwarebytes: Malwarebytes Anti-Malware - Free software downloads and software reviews - CNET Download.com
Also ensure you are using Microsoft Security Essentials. If not, then uninstall other antivirus and install MSE: Microsoft Security Essentials
PAGE_FAULT_IN_NONPAGED_AREA (50) Usual causes:
Defective hardware (particularly memory - but not just RAM), Faulty system service, Antivirus, Device driver, NTFS corruption, BIOS
Your last minidump is indicating "dxgmms1.sys", which is a Direct X file. you should update your video drivers from the Nvidia site.
Also, make sure to remove old drivers using driver sweeper. Follow all instructions, then install the most recent drivers, nonbeta. I usually download(dont install) the drivers first so they are already there to just install after everything is cleaned by sweeper. Drivers - Clean Left over Files after Uninstalling
You should also enable driver verifier to get some more minidump files to analyze and run memtest86+, as bad ram causes a lot of problems.
Follow all instructions carefully, and make sure you run memtest for atleast 7 full passes. Using Driver Verifier to identify issues with Drivers RAM - Test with Memtest86+
Please post back with any results or questions