How do I find and delete invisible files?

Mac Hard Drive info window says 157.58 GB used and 159.56 GB capacity, leaving 1.99 available. 
Total for all folders in Mac HD is 133.344 GB.
14.13 GB  Library
04.81 GB System
114.4 GB Users
16.58  GB Applications
.004   GB  User Guides and Info
I appear to missing about 20 GB storage that I desperately need.
What is going on?
How do I clear out "invisible file" if that's what's taking up the 20 gigs?
How do I prevent this from happening again?
Please advise.
Thank you. 
I have a MBPRO 2.26 running OSX 10.6.8

Thanks so much  for your response.
Do you have any idea why there are 20 GB unaccounted for?
My hard drive seems to fill itself up continouously...I'd like to figure that one out.
Yes...Getting a larger HD is a great idea.
Does having a large HD impair performance?
I am thinking about getting a 1.5 TB Seagate Barracuda.
http://www.amazon.com/Seagate-Barracuda-3-5-Inch-Internal-ST1500DM003/dp/B005T3G RPU/ref=aag_m_pw_dp?ie=UTF8&m=AVCN3MVCVULPH

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