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Good to hear it worked for you. I don't think it's a permission issue. I think it's just an installer problem.
Eugenia, I use it on the orginal Mac Air with 2 GB of RAM and 64 GB of SSD, which is slower than the 2nd generation MBA. Parallels 4 and prior...
simpler method Guys, I had the same problem and it keeps re-appearing every once in a while. A simpler solution that fixes the problem for me...