Windows 10: My PC keeps crashing/freezing and I don't know why! Please help!

Looking for help please. I have a HP Pavilion Gaming Desktop TG01. It has been fine for two years but for some reason it now seems to crash at random almost every time I turn it on. Sometimes lasts 5 minutes, sometimes crashes during boot, it is completely random but doesn't usually stay operable for more than 15 minutes. I have 'Reset my Pc' , reinstalling windows from cloud and wiping all my files etc in the process. I feel like I have run every diagnostic and have came up with no issues or solutions. I feel completely at a loss of what to do here to get this back to working again. Specs ar

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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.

 

OS version 7629. I don´t know wich version is that, NoDO? Mango?

I just bought a Samsung Focus AT&T Rev.1.3. It comes with OS version 7629. I don´t know wich version is that, NoDO? Mango? Third Pary apps just crash after I open them, help!