| You DO need to provide a few more particulars! Model, OS, etc.
Start up with your install disk by holding down the "C" key. When started, navigate to Utilities-->Disk Utility in the menu bar at top. Run it after highlighting your HD.
This SHOULD fix it, but if not, make notes of the results and post here.
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MBP, 17", 2.6 Mhz Core 2 Duo, 4G RAM, 200G 7200 drive, Hi-Def. Glossy screen; iPhone
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