Random blue screen

[Josh]

I perviously had a problem with my OC system that kept on blue screening, but i contacted PCS and got that resolved (Had to decrease the OC). However I have recently had 2 blue screens, each on seperate days. Both times I was playing WoW and when i turned the PC back on it told me to reboot and insert proper boot device. I turned it off and left it for around 15 mins, turned it back on and it was fine. This worked for both occasions, however I don't want to leave it and it become gradually worse. So i went into Event Viewer and found the problems, I found the source was Kernel-Power. The only thing i can think that may be is the power supply, but it's been running fine for months and there have been no changes to the hardware. Here is a copy of what came up in the Event Viewer

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>2</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2011-11-29T16:12:54.072406300Z" />
<EventRecordID>47083</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Joshua-PC</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">false</Data>
<Data Name="PowerButtonTimestamp">0</Data>
</EventData>
</Event>

If anyone could help in anyway it would be much appreciated.

Josh.