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System extension cannot be used

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Joined
Jul 6, 2012
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7
Motherboard
Mac OS X 10.9.5
CPU
i7 4790k
Graphics
GTX 650 Ti 2GB
Mac
  1. iMac
  2. MacBook Air
Classic Mac
Mobile Phone
  1. iOS
Lost permissions

I'm getting countles series of similar looking error when asigning myself as the owner to the system drive (right click, unlock, hit "+", add meuser, apply to enclosed folders, errors:

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

For a while now I don't get any results in spotlight / Alfred, now I wanted to know why. Started digging, looked into possible missing permissions, noticed that I as a user am not asigned to the system drive, so my user name is just missing, others like system/wheel/everyone are there, but not my user. Tried to change that by adding myself like described above and so on...

What should I do? I've got a backup, but it's not that old, so the issue might be on the backup as well.
Disk Utility showed conflits. Repair permissions worked without issues though.

Please let me know if you need anything. Tnx for looking into this.

edit:
DPCIManager (Repair permissions), the list is actually longer.
20/11/15 21:40:50, com.apple.kextd[12]: Can't create kext cache under / - owner not root.
20/11/15 21:40:50, com.apple.kextd[12]: YamahaSteinbergUSBAudio.kext has no Info.plist file.
20/11/15 21:40:50, com.apple.kextd[12]: Can't create kext cache under / - owner not root.
20/11/15 21:40:50, com.apple.kextd[12]: Can't create kext cache under / - owner not root.
20/11/15 21:40:50, com.apple.kextd[12]: YamahaSteinbergUSBAudio.kext has no Info.plist file.
20/11/15 21:40:50, com.apple.kextd[12]: Can't create kext cache under / - owner not root.
20/11/15 21:40:50, com.apple.kextd[12]: Rescanning kernel extensions.
20/11/15 21:40:50, com.apple.kextd[12]: Can't create kext cache under / - owner not root.
20/11/15 21:40:45, Repair Permissions[532]: Finished repair
20/11/15 21:40:45, Repair Permissions[531]: Finished xattr
20/11/15 21:40:45, Repair Permissions[529]: Finished chown
20/11/15 21:40:45, Repair Permissions[527]: Finished chmod F
20/11/15 21:40:45, Repair Permissions[522]: Finished chmod D
20/11/15 21:40:45, Repair Permissions[517]: Finished chmod N
 
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