Hey everyone, long time reader, first time poster! well I had received developer preveiw 3 for OS Lion (macbook Pro early 2011). and I wasn't able to upgrade to the final easily. well, I'm semi new to mac. I had no idea what I was doing, and I went to the utility and deleted everything from my mac. I can't do anything....at all. I tried re-installing preview 3 and it says the version I have is damaged. and that's pretty much the only menu I can get to (disk utility). How can I fix this? preferably getting back to snow leopard and just skip to the final release of lion. please help me! I can supply screen shots as well if needed.