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Hello some has already help me with this and it worked but i had to reinstall so now i have to fix it again...

I dont remember where the post was and i cant find it. I looked at others but they dont work or are much to complex....this is my error

 

The system extension “/System/Library/Extensions/AppleAC97Audio.kext“ was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.

 

and

 

The system extension “/System/Library/Extensions/AppleAC97Audio.kext/Contents/PlugIns/AppleAC97AudioIntelICH.kext“ was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.

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https://www.insanelymac.com/forum/topic/29613-system-extension-cannot-be-used/
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