HT201250 i was trying to manually erase files from my macbook air. at one point, my system preferences disappeared from the dock and i had a pop up message telling me the application was 'incomplete'. I tried to reinstall iLife but i wont work.

I used the small key that comes with the air but it doesn't seem to be doing much. Am i supposed to be reinstalling OS X or iLife? I tried OS X and I didn't see much difference except for the return of my system preferences and safari which had initially disappeared, but I'm still missing the App Store and iPhoto. I can't reinstall iLife either.

Try a few things: 1) restart in safe mode (restart holding the shift key) and this will repair the drive (if need be) and trim/delete cache files. Restart normally.
2) if you use iPhoto or Aperture launch the program and then empty the trash folder of the program(s).  Launch your Mail program and check out how much is in the Trash and Archive folders. You can delete the really old stuff if there is any.
3) Download omniDiskSweeper (free) to see what's on your drive. Be careful about deleting anything that isn't in your personal drive space and be very careful about deleting anything in the Library folder.

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