I wanted to clean install my laptop. I have reformatted/ erased the hard drive on my MacBook Pro mid 2009, 2.66 Gh SD. Everything was just fine as I followed the steps until problem came out. The installation was stop at 28 % progress (I can't remember the message from pop up window).I have another OSX snow leopard installation disc which comes with my iMac. Then restart with that disc but the installation window said "this OS disc can not be installed on this computer". Would it be just a bad installation disc? Please help..