Windows 7 Freezing

[duracellmonkey]

Hey!

I have a problem which is a pain to me.

Pretty much every time I see a program not responding like: Firefox, Oracle Virtualbox etc. Windows 7 just freezes and sometimes gives a error that Microsoft Windows is not responding and then I just have to force it to shut down. Ctrl Alt Del or anything like that won't help to unfreeze it.
It's a totally legit version of Windows 7, not any pirated version.
It literally always happens when something is not responding, It happened twice with me today already and I can't use my computer properly whitout knowing It will freeze. It's not related to overheating, I've cheked the temps and all is OK.

Hardware:
Motherboard: Gigabyte Z87-HD3
Processor: Intel Core i5-4570S 2,9GHz
GPU: Gigabyte Geforce GTX 760 2GB DDR5 OC version
RAM:Crucial Balllistix 4GB DDR3 (2X)
OS: Windows 7 Home Premium
PSU: Chieftec CTG-750G 750W
HDD: Seagate 2TB

I don't want to give up and just reinstall Windows 7, just too much work right now. Is there any way to fix it?

 

[Alin Prema]

I suspect that "Cheaptec" PSU. I had freezing problems with weak PSUs before and i recommend trying to power your system with a better PSU first and then start to investigate further.

 

[duracellmonkey]

I'm really hoping it's not the hardware, is there another way to find a fix to it? I checked event viewer after the windows froze and I saw Kernel-Power Event ID:41 errors.