Constant Random BSODs on a 5 days old system

Computer Type: PC/Desktop
System Manufacturer/Model Number: 76~2.0
OS: Windows 7 Ult x64 - SP1/ Windows 8 Pro x64
CPU: Intel Core i5-3570K 4.6GHz
Motherboard: Gigabyte GA-Z77X UD3H, f18
Memory: 8GB (2X4GB) DDR3 1600 Corsair Vengeance CL8 1.5v
Graphics Card: Sapphire HD 7770 Vapor-X OC 1GB DDR5
Sound Card: Onboard VIA VT2021
Monitor(s) Displays: 22" LCD Dell
Screen Resolution: 1680x1050
Keyboard: Logitech Wave
Mouse: CM Sentinel
PSU: Corsair HX650W
Case: Cooler Master Storm Scout
Cooling: Corsair H80 2x12cm Noctua NF P12 , 2x14cm case fans
Hard Drives: Samsung 840Pro 128GB SSD, Seagate Barracuda 500GB SATA2 7200rpm 32MB cache, Seagate Barracuda 1TB SATA2 7200rpm 32MB cache,
Internet Speed: Dismal
Browser: Opera Next
Antivirus: Avast
Other Info: Haswell laptop: HP Envy 17t-j, i7-4700MQ, GeForce 740M 2GB DDR3, 17.3" Full HD 1920x1080, 16GB RAM, Samsung 840 Pro 128GB, 1TB Hitachi 7200 HDD, Desktop: eSATA ports, External eSATA Seagate 500GB SATA2 7200rpm, External WD USB 500GB