Windows 10: What is causing these crashes?

I just built a new pc and have been getting random crashes and restarts no blue screen. This seems to only happen when I am playing games. So far it has not had any problems when just using a browser. I have done all kinds of troubleshooting methods I can find online and none of them have reported any errors. I looked at the minidump and it gives error code "NTSTATUS 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.". Is this a memory problem? I keep getting errors similar to this. I have already tried both memtest and windows memory diagnostic whi

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GPU-Z 0.7.5 causing crashes on load up

Any chance you could narrow it down to which running application causes GPU-Z to crash? Ideally steps to reproduce for me here.

 

all games crash!

I suggest you run rthdribl > http://www.daionet.gr.jp/~masa/archives/rthdribl_1_2.zip
Increase the window size step by step and watch your vga temps permanently.
What happens?
If it crashes, run at stock speeds as suggested before and retry.

P.S.: When your system locks, does the display signal turn off after a time?
Stuttering sound or no sound at all when freezing?
What X1800XT model do you own exactly?

 

all games crash!

ive watch my temps and both the cpu and gpu are within normal ranges. when it freezes it simply freezes the image and stops the sound. i must reboot to get back to windows.