Hey guys I've recently bought a PC from here and I've had a problem with random crashes. So far the only thing I've had on the PC is Steam games, Origin (Battlefield 3), Java, Windows Security Essentials, Skype and a few other things such as Chrome and drivers for my Razer Lycosa and Naga. I've been getting some crashes which are completely random, most of which have been just through browsing through the web/talking on Skype. I first encountered this problem a day AFTER I got my PC (or started using it as I did leave it for 2 weeks to go on holiday) where I was just surfing the web and it crashed.
My specs are as follows;

Case PCS MAELSTROM T900 BLACK GAMING CASE
Processor (CPU) Intel® Core™i5 Quad Core Processor i5-3570K (3.4GHz) 6MB Cache
Motherboard ASUS® P8Z77-M: MICRO-ATX, USB 3.0, SATA 6GBs, ATI®CrossFireX
Memory (RAM) 8GB SAMSUNG DUAL-DDR3 1333MHz (2 X 4GB)
Graphics Card 1.25GB NVIDIA GEFORCE GTX 570 - 2 DVI, HDMI, DP - 3D Vision Ready
2nd Graphics Card NONE
3rd Graphics Card NONE
Memory - 1st Hard Disk 1TB 3.5" SATA-III 6GB/s HDD 7200RPM 32MB CACHE
2nd Hard Disk NONE
RAID NONE
SSD CACHE DRIVE NONE
1st DVD/BLU-RAY Drive 24x DUAL LAYER DVD WRITER ±R/±RW/RAM
2nd DVD/BLU-RAY Drive NONE
Memory Card Reader INTERNAL 52 IN 1 CARD READER (XD, MS, CF, SD, etc) + 1 x USB 2.0 PORT
Power Supply 600W Quiet 80 PLUS Quad Rail PSU + 120mm Case Fan (£59)
Processor Cooling INTEL SOCKET LGA1155 STANDARD CPU COOLER
Fan Controller NONE
Sound Card ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities WIRELESS 802.11N 300Mbps PCI CARD (£16)
USB Options 6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD
Modem NONE, I WILL BE USING BROADBAND
Floppy Disk Drive NONE
Firewire NONE
TV Card NONE
Operating System Genuine Windows 7 Home Premium 64 Bit w/SP1 - inc DVD & Licence
Office Software NO OFFICE SOFTWARE
Anti-Virus NO ANTI-VIRUS SOFTWARE
Monitor NONE
2nd Monitor NONE
DVI-D & HDMI Monitor Cables NONE
Eyefinity / GeForce 3D Vision NONE
Keyboard & Mouse NONE
Mouse NONE
Speakers NONE
Webcam NONE
Headsets (VOIP) NONE
Surge Protection NONE
Cable Tidy NONE
Printer NONE
External Hard Drive NONE
Warranty 3 Year Standard Warranty (1 Month Collect & Return, 1 Year Parts, 3 Year Labour)
Home Installation NONE
Data Recovery NONE
Delivery STANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build Time Standard Build - Approximately 10 to 12 working days
Charity Calendar NONE

No I have not chosen to overclock my system either.
Sorry if I seem a little rude or give less information than what is needed.
Hope someone can help me. Thank you!