HT3680 Less disk space after then before

I ran this utility and it took up more disk space- now I have less space then when I started.
Now what do I do?  No matter what I remove I gain no extra space.
Help....

My apologies, the disk utility that comes with Mac OS.
I went to Launch Pad -> Utilities -> Disk Utility and ran the procedure by selecting the Erase tab and pressing the Erase Free Space... button. I choose the default option and let the program finish running. At the end I had less disk space reporting by this Utility then before the Utility ran.
I checked the Activity Monitor to confirm the amount of space free and it agreed with the Disk Utility.
I started the procedure as my Mac was running extremely slowly. It is a MacBook late 2008 model and upgraded to Mac OS X 10.7.5, which is as high as I can upgrade. If I try to upgrade further I receive a message that the Mac cannot support the next level upgrade.
 I Have a 2.4GHz Intel Core 2 Duo Processor, with 2GB memory.  When I check About this Mac it agrees with the amount of space available as the other two programs (Disk Utility and Activity Monitor). 
The Mac is still running slowly.
I did check the HD with a commandi and this reports 76.72 GB free space.
I know the Mac does a lot of swapping but why hasn't performance improved?
I was thinking of purchasing an additional app or software such as Drive Genius but not sure it will help.
Any thoughts?

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