Random system lockups during gameplay!

Hello!

This issue was first discovered by me when I was playing World of Warcraft; which made it even more frustrating! The problem is that my system randomly locks itself up during gaming. Sometimes I can play for 16 hours straight and not a single problem, at other times I am only able to play for about one hour before the system freezes, then I am forced to reboot the entire system because the ENTIRE system is TOTALLY UNRESPONSIVE! (No error messages are displayed at all)
I checked Microsoft's homepage for error messages and I came across this article where people seemed to have the exact same problem as me. But unfortunately, no solutions on the page.

I went into the Windows Event Viewer, and checked the error messages, which had a small result, namely an ERROR message at the exact time when the system locked up the last time. The error message is as follows:

Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected.

I have figured it has something to do with my "system root" (?)

It also says the following:

* Source: WMI (What is this?)
* Log Name: Application
* Event ID: 10
* Level: Error
* OP Code: Info
* Logged: 10/27/2008 8:47:12 PM
* Task Category: None
* Keywords: Classic
* Computer: My-PC



I had this issue before, but never as often like it is now. It started to occur more and more frequently until it reached a limit where I re-installed Windows Vista: Home Premium, completely thinking that this would solve the issue, but it DID NOT!