This is on an early 2008 MacBook Air, 1.8 GHz Core 2 Duo with 2 GB RAM and the MacBook Air SuperDrive: ATTEMPT #1: Insert DVD. Finder window takes a LONG time to come up. When it does, the "Install Mac OS X" icon has the wrong icon on it. Double-click it anyway, choose the disc I want to install to (my local SSD). Setup churns for a minute, says it's going to take 6 hours to complete, and then abruptly stops and advises me to carefully clean my DVD. I eject the DVD, clean it carefully (it had some smudges on it that did NOT come from me), restart the MacBook Air, and try again. ATTEMPT #2: Insert DVD. Double-click "Install Mac OS X". It churns for a second, shows the initial window. I click Continue and the program crashes with no error message during "Finding Disks". ATTEMPT #3: Exactly the same as Attempt #2. ATTEMPT #4: Restart the MacBook Air AGAIN, with the DVD still in the SuperDrive. Log in as usual. The Finder window for the DVD takes a couple of minutes before it appears. Double-click "Install Mac OS X". Click Continue. Beachball appears and stays up for a couple of minutes before disappearing. Click Continue AGAIN. Beachball appears again and finally gives me the license agreement. Click Agree, and the program crashes again. Apple: WTF? This is WORSE than when I tried to upgrade Windows XP to Vista. Windows 7, just so you know, has installed PERFECTLY every time I've done it, on several different machines.