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The Instruction at "0x241f8977" referenced memory at "0x01cdf5c0". This memory could not be "read".

Click OK to terminate this program.


Ok, when playing the newly released Half Life 2 and Counter Strike Source on XP, it crashes and it comes up with this error message. What causes this error and how do I fix it?

BTW I am using XP.

Thanks for your help.
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