Why I can't start mac osx,How to repair

[Hang Oukim]

I have installed window Vista Home premium in the parallel, unfortunately that disk is not good and lead to error and uncomplete installation. And prompted the text " Can't finish, file remain unsaved chang ". So I forced quit it because it was not responding. Then I restart my mac os ,but it does not work. It only has the mouse pointer on the empty screen, and i waited for long,it still the same. Please tell me how to fix it.
If it related to installation or repair mac os, please also tell me how to do it. Thank you in advance.

 

[Satcomer]

find you OS X install disk and boot with that. Before it gets to deep into an installation look for the finder like menu to show up and in there will be 'Disk Utility'. Launch that and "Repair Disk" and 'Repair Permissions" after repair the disk. Hopefully this should help.