This error appears everytime I start my computer

[CrazyLegs0892]

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BN*.tmp - Application Error
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The exception Illegal Instruction

An attempt was made to execute an illegal instruction.

(0xc000001d) occurred in the application at location 0x7c80ba00.


Click on OK to terminate the program
Click on CANCEL to debug the program
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OK Cancel
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* denotes any number between 1-13

This error appears everytime I start up my computer and ever since it appeared I could not play any Source engine game. Any time I attempt to play one of these games I get this error.

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hl2.exe - Application Error
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The instruction at "0x2a02e59a" referenced memory at "0x00000000". The memory could not be "read".


Click on OK to terminate the program
Click on CANCEL to debug the program
---------------------------
OK Cancel
---------------------------

Is the error evidence of malware or anything of the sort. I deleted all BN*.tmp files from the C:\WINDOWS\Temp folder but the files reappear on restart.

 

[Ijack]

Google "hl2.exe" and you'll find several threads about this sort of problem.