Help with random crashes!

Hi my system has be freezing and I'm really not sure what the problem is. It can happen when I'm playing games or even when I'm just browsing. The freezes can come withing 5 minutes or a couple of hours. When its frozen the power or reset button don't work on my case until I hold the power down for 6 seconds. When I boot up again it just starts up as normal :S This has been happening for about the last 6 months (when I bought it). The caps lock key doesn't light up when its frozen. Oh and the audio freezes as well.

I've change gpu drivers a few times and it doesn't seem to make a difference. Also, sometimes when starting up it will show a desktop with a stock background and half my icons missing. Not sure if this is connected at all but it always goes back to normal upon reset.

My specs are as follows:

Gigabyte SKT-1155 Z77-D3H Motherboard
Intel Core i5 3570K
ASUS - ENGTX560Ti Nvidia PCI-E Graphics Card - 1GB (327.23) (Using intergrated gpu doesnt fix)
8gb Corsair Vengeance (2 x 4GB) DDR3 1600Mhz
SanDisk SDSSDX-120G-G25 120GB Extreme SATA III 6Gb/s SSD
Windows 8.1 (crashes still happened with win 8.0)
Corsair CXM 600W (already swapped the psu out once)

Upon checking event logs after freezing. These occur at the time of freezing:

The only thing it says in event viewer is. :Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 02/02/2014 14:14:29
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer:
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/…
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D… />
<EventID>41</EventID>
<Version>3</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2014-02-02T14:14:29.27884280… />
<EventRecordID>19724</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Nexus4</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">0</Data>
<Data Name="PowerButtonTimestamp">0</Data>
<Data Name="BootAppStatus">0</Data>
</EventData>

ALSO AT THE SAME TIME:

File System Filter 'npsvctrig' (6.3, ‎2013‎-‎08‎-‎22T11:38:22.000000000Z) has successfully loaded and registered with Filter Manager.

XML:

<Event xmlns="http://schemas.microsoft.com/win/…
- <System>
<Provider Name="Microsoft-Windows-FilterManager" Guid="{F3C5E28E-63F6-49C7-A204-E48A1BC4B… />
<EventID>6</EventID>
<Version>0</Version>
<Level>4</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2014-02-04T22:12:11.27901740… />
<EventRecordID>20094</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Nexus4</Computer>
<Security UserID="S-1-5-18" />
</System>
- <EventData>
<Data Name="FinalStatus">0x0</Data>
<Data Name="DeviceVersionMajor">6</Data>
<Data Name="DeviceVersionMinor">3</Data>
<Data Name="DeviceNameLength">9</Data>
<Data Name="DeviceName">npsvctrig</Data>
<Data Name="DeviceTime">2013-08-22T11:38:22.00…
</EventData>
</Event>

Anyone?
http://answers.microsoft.com/pt-br/windows/forum/windows8_1-tms/ajuda-pc-sempre-a-desligar-se/3fa1ed34-8b58-410a-8892-d52ae3f38522

 Heres a thread with someone with what looks like the exact same issue, in Spanish. Google translate only goes so far sooo....

Any help would be great thanks! :)