Why does my Macintosh HD and Utility Disk give different available space values?

My MacBook Pro (about a year and a half old) has started running extremely slowly out of the blue, to the point it is barely functional. I've tried basically everything, restarting, cleaning up the desktop, clearing out my downloads file, starting in safe mode, resetting the PRAM, updating the operating system. Now my Mac HD says it has about 400GB free space out of 700GB, however today I was running utility disk to see if that would detect a problem and when selecting the first Macintosh HD option it says I only have around 18MB free, is this my problem? and if so how do I fix it? and why would I have two different values for available space? The second Macintosh HD entry does have the same available space in the get info page as is listed in the Disk Utility.

“Finder does not take into account the  Backups/ local snapshots,
but disk utility includes them.”
http://pondini.org/TM/30.html
Disk space / Time Machine ?/ Local Snapshots
Local backups
http://support.apple.com/kb/PH18861?viewlocale=en_US&locale=en_US

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