I try "Get Info" of my Macintosh HD and the information given is incorrect

I tried the "Get Info" option on my Macintosh HD icon and when it opens, the information that is given is incorrect.
I checked that info with "System Information" and I found out that I have 424.88 GB out of 499.25 GB.
How can I fix it?

If you really want to start fresh and you have ANY PERSONAL files already backed up, or you don't care about them, stick the thumb drive in the USB port and reboot the system. Hold down the Option key when you hear the apple startup sound, let it go after about 15-20 second. That will give you a screen where you select which drive to boot off of, select the thumb drive. Once that has booted go to Disk Utility and RE-Partition the drive. That will wipe all information off it. Once that is done close Disk Utility and you will be back at the original screen. Select Install OS X Lion.
Have fun.

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