I bought a MacBook Pro a couple of days ago and everything is good, except I had to tinker with some files in order to install a program.. So, I needed to alter the permissions for the folder in order to edit the document (it was the hosts file). I thought to myself, why not just give myself read/write permission for every file on my entire HDD, so I went ahead and did just that. When I tried to install a program the next day, it said the installer app was broken, and an error message popped up for every single .kext in the system/library/extensions folder. Well, I did some googling and found out it had to do with those permissions I'd been messing with! Ran the disk tool thingy, which has an option to repair permissions, and that seemed to work.. somewhat. There are still 6 specific .kext files from the extensions folder that keep popping up error messages, reporting that the files are broken and that I need to reinstall. I didn't make a note of the specific files, suppose that would've been wise to include here.. But perhaps someone recognizes the problem regardless, and knows of a fix? Please? Completely new to Mac, and this is sort of disturbing to me. Also, I had installed Paragon NTFS to read/write to/from my external HDD, and that has seized to work - one of the error messages concerns a .kext which is related to this program.