Macbook froze, when I restarted it it took 2 hours to boot up, then everything was SUPER slow. Any idea why or what to do?

Yesterday when I was surfin on my Macbook Pro, the screen suddenly froze. I thought it wasn't a biggie so I just turned is of and on again. But it took hours to start it, and when it finaly started everything on my Mac was SOOO slow. At this stage I can't almost use it. Does anyone know how to fix it, and does anyone know why it happened?

Reboot holding down the command-r keys into the Lion Recovery disk. Run Repair Disk from Disk Utility.

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