I had a friend come by earlier and she left her new MacBook with me to fix. She tried to install Windows through Boot Camp via an old Dell XP Restore CD (doh!). Whenever you turn it on it only displays the error: Windows could not start because the following file is missing or corrupt: <Windows root>\system32\hal.dll. Please re-install a copy of the above file. Now, when I turn it on and hold down the option key, the Windows hard drive is the only one that shows up. No OS X. Am I correct in assuming that she has told Windows to take over her hard disk and hosed up OS X completely? Is all of her OS X data gone beyond reasonable recovery? Thanks.