[Kyoukan]

Hello all, new user here, running into a small issue which I haven't been able to troubleshoot myself as of yet. The problem is this; While running games (although the problem has occurred when uTorrent is running and twice it has occurred just while browsing the internet [Chrome] and listening to music [Winamp]), my keyboard and mouse suddenly turn off. While playing games, the last key that is pressed is "held down" in the game, until my computer freezes, which normally takes a couple of seconds. If there is sound or music playing, it will loop the last few sound bytes and the only way to fix this problem is a reset using the power button, as the reset button stops responding. I've tried both updating and rolling back drivers, but this solution yielded nil results, as did re-installing the motherboard driver. My system is as follows:

OS
Windows 7 64 Bit - Skinned.

COMPUTER

INTEL Core i7 3770k @ 4.2Ghz

Noctua NHU9BSE2 CPU Cooler

GIGABYTE WindForce GTX570 Overclock Edition

GIGABYTE Z77X-UD3H Motherboard

16GB Stronium DDRIII 1600Mhz RAM (2x8)

Intel 525 Series 120GB mSata SSD

500GB Western Digital VelociRaptor 10,000 RPM Sata III HDD

3TB Western Digital Sata III HDD

Fractal Design R4 Black Pearl Case

4 x 140mm fans Fractal Design and Corsair

1 x 120mm Corsair AF120 bottom intake fan

CORSAIR CX750M Modular PSU

Logitech G105 USB 3.0 Keyboard

Logitech G500s USB 3.0 Mouse

I also have a Logitech USB Webcam connected, and a 3TB Western Digital External HDD connected, and a Belkin USB Wifi dongle.

SYSTEM INFORMATION FROM WINDOWS
OS Name Microsoft Windows 7 Ultimate
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name KYOUKAN-PC
System Manufacturer Gigabyte Technology Co., Ltd.
System Model To be filled by O.E.M.
System Type x64-based PC
Processor Intel® Core™ i7-3770K CPU @ 3.50GHz, 3901 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. F18, 24/10/2012
SMBIOS Version 2.7
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume3
Locale Australia
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name Kyoukan-PC\Kyoukan
Time Zone E. Australia Standard Time
Installed Physical Memory (RAM) 16.0 GB
Total Physical Memory 16.0 GB
Available Physical Memory 13.4 GB
Total Virtual Memory 31.9 GB
Available Virtual Memory 28.9 GB
Page File Space 16.0 GB
Page File C:\pagefile.sys

If any more information is needed I am happy to provide it.
Thank you for your time and help.