My internal hard disk has only 40 mega bite left but loosing space every day .how can make free disk space?

my internal hard drive had 13 gig .now I have only 40 mega bite. I am loosing space everyday, but I do not know where I am loosing space to. I have deleted four thousand email from my in box.still disk space has not increased. I have programs I have installed , all are useful I can not remove them from my... show more my internal hard drive had 13 gig .now I have only 40 mega bite.
I am loosing space everyday, but I do not know where I am loosing space to. I have deleted four thousand email from my in box.still disk space has not increased. I have programs I have installed , all are useful I can not remove them from my Internal hard drive.
I have an external hard drive that has 80gig free space , How Can I transfer some of my programs.

4000 email I deleted from in box , where are they?
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