My PC Randomly Bluescreened... HELP!

[Willmo]

I have just finished building my own PC, and yesterday, I was on Skype and it randomly bluescreened, I thought nothing of it and moved on. However today, as I was shutting my system down, it occured again. Have I done anything wrong? Can you please give me some tips etc.
Thanks
Will

 

[AnEwG]

Please post detailed specifications of your system so that we can help you.

 

[Willmo]

Please post detailed specifications of your system so that we can help you.

What do you mean? My PC Build?
If so the specs are...
AMD FX6300 Black Edition
AMD Sapphire 7750 2GB
Seagate 1TB Barracuda 3.5 inch HDD
Crucial 8GB (2x4GB) Ballistix Tactical Memory Kit
Cooler Master 500W 12V Elite Power 500 PSU
Asus M5A78L-M/USB3 Motherboard (Socket AM3+ up to 16GB DDR3, USB 3.0, uATX)
Windows 7 Ultimate 64 Bit OEM

That is my build

 

[AnEwG]

Use a program like HwiNFO to monitor CPU and GPU temperatures. The maximum safe temperature for FX-6300 is 60-62.5 C.