PC freezing problem, please help!

So, I have had my gaming PC for about a year now and after using it I stumbled across a problem, a very frustrating problem. Every time I run ONLY Sony Vegas Pro 13 or Minecraft, it forces my PC to crash. The game/application runs perfectly fine from 5 minutes to 2 hours and finds that it has the need to freeze my PC. I also used a software that updates all my drivers which didn't work and ran C-Cleaner to clean anything. Remember, it is only these two applications, everything else seems to run great. When my PC froze the last time, I tried CRT+ALT+DEL, nothing happened. The PC was 100% frozen. I can see the screen, no blue screen of death, it's just frozen with what I am doing. Can anyone explain this and whats going on? PC Specs: Processor: Intel Core i7 4770k RAM: 16GB Corsair Vengance GPU: AMD Radeon R7 200 Series HDD: 1TB Thanks everyone!
Answer:

Most likely this is a hardware problem. Is your power supply good enough? Power supplies lose some capacity over time, maybe it was barely good enough before, and now it is not good enough? The thing with power supplies is spending and extra $10 - $20 can get you an extra 100 - 200 watts easily, so when you are building the system it makes sense to go higher than you think you'll ever need. You can also test your RAM. And blow out any dust from your heatsink.

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