I've MacBook Pro 2009 model... from last few days my airport is not functional. This happened when I deleted list com.apple..... from systems folder from library- preference- system. Now, when you check the status of Airport hardware it says "Not

I've MacBook Pro 2009 model... from last few days my airport is not functional. This happened when I deleted plist of com.apple..... from systems folder from library-> preference->system. Now, when you check the status of Airport hardware it says "Not Associated".  One more thing that came to my notice is that 'com.apple.internetconfigpriv.plist' this file is missing from system folder. Any help would be appreciated.
Thanks

Thank you for your reply......
I have tried using different OS 10.7, 10.8... further OS doesn't suit my MacBook, so currently I am on 10.6. I did reinstallation twice using 10.6 but the files were not restored.
Yes.. I am talking about internet wireless card.
I don't have back up files for files which i deleted and they are not in trash as well.... the reason I deleted files was from the image attached from OSXdaily.com
I have tried resetting the PRAM, NVRAM, SMC but to no use.
now what do I do.??

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