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How to stop "System extension cannot be used" appearing

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I have successfully installed Mac OS Lion on my PC. I use VoodooHDA.kext to get my audio however I get this error every time (image below). I installed the kext by dragging and dropping into /S/L/E/. My sound however is working fine.

 

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My Question:

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How do I get stop this error from showing every time I turn on my PC without removing this kext?

 

 

Image:

https://www.dropbox.com/s/agghu1s7luy7fwr/Screenshot.png?dl=0

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Or manually repair permissions from OSX terminal - type the following lines, followed by <Enter> after each line...

sudo -s
chmod -R 755 /System/Library/Extensions/VoodooHDA.kext
chown -R 0:0 /System/Library/Extensions/VoodooHDA.kext
touch /System/Library/Extensions
exit

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