Don't dispare here! Yes, you can reformat the HD, but in doing so you will loose anything thats on it now.
If you can get an external HD (firewire {best for speed} or USB) use Apples '''Time Machine''' to make a backup of your current files (yours) so you can restore them afterwards.
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Use the DVD to boot your system it should prompt you if you want to reformat the drive if not select it from the pull down menu.
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Use the DVD to boot your system it should prompt you if you want to reformat the drive, if not select it from the pull down menu.
Don't dispare here! Yes, you can reformat the HD, but in doing so you will loose anything thats on it now.
If you can get an external HD (firewire {best for speed} or USB) use Apples '''Time Machine''' to make a backup of your current files (yours) so you can restore them afterwards.
Use the DVD to boot your system it should prompt you if you want to reformat the drive if not select it from the pull down menu.