This may be a dumb question BUT... If i reinstall the OS on my macbook pro will it wipe my hard drive clean? Do I have an option? Side note: The reason is because I am having some Photoshop CS4 issues with the license being expired and I have researched and executed every plausable option to fix this, and I'm afraid the only option I have left is to move my stuff onto an external and wipe it clean and reinstall. Anyone possibly know an alternate, better solution? Thanks very much in advance!