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Re:OS X Lion: Apple’s Vista moment by llambda on Wednesday August 31, 2011 @11:22AM (#2945917)
Try a clean install. As always, this is the preferred method for upgrading. (This is because there can be user-installed software that had explicit dependencies on the older environment.)
Re:OS X Lion: Apple’s Vista moment by dasil003 on Wednesday August 31, 2011 @05:01PM (#2947538)
And just FYI, to do a clean install with only one download of Lion you need to burn a disk or create a USB stick before you install it because it deletes the installer.

See http://lifehacker.com/5823096/how-to-burn-your-own-lion-inst...