I use a 2008 Macbook white . core 2 duo 120gb hdd 4gb ram(667 mhz ddr 2) . I tried installing os x lion in my macbook white but faced the same problems everytime i installed it.At the end of the screen "preparing to install mac os x on the disk " it says error . the installer stops in the middle with time increasing and then moves slowly and then again speeds up in the end and hangs and shows the following error " an error occured while preparing the installation .Try running this application again.If the problem persisits,use Startup Disk to restart from your os x install dvd". when i tried running start up disk as install dvd it did not accept and showed error.I tried the install about 5 times .