Needing help - Positive and better sides of building a new PC rather than fixing it!

Okay vague question, Vague answer : Go buy a new one.

Now if you really want to diagnose your problems then lets do the basics.

Open Computer, Can Air dust out the bunnies and use paint brush on the vents, coolers, fans, etc.

Download and run SPECCY, copy and paste the first tab to tell us WHAT your computer is and your idle temps

Download and run MSI Afterburner, run the games your having problems with (be great to tell use what games too), what temps are you getting when underload?

Did you install all Windows Updates Including options except BING?

Download and run Slim Drivers, install all the latest updates but you don't need to reboot until you do the last update

What Antivirus do you use? If MSE remove it immediately, or no AV, go to www.filehippo.com and download AVAST! or AVG and do a full system scan

Download Malwarebytes do a full system scan (AV doesn't pick up alot of malware)

What 'crash' is it? BSOD? A error window? What? More info on what 'error' is happening tells us more to look at then 'crashing game'.