After installing  win7 I had 16 of 50 GB left

How do I figure out what is taking up all that space and what can I do to reduce it?
I have a late 2009 iMac 27" core i5 266GHz with 12 GB of RAM. 1TB HD.
Thanks

Yeah, those are about the responses I expected. But since the both of you either don't know or are stuck in a mindset from 2001, let me bring you up to speed.
http://support.microsoft.com/kb/889654
That link isn't telling you how much you need but will allow you to make your own determination. Heck, even those involved in the design of Windows have admitted that the limits they chose were "somewhat arbitrary."
Read the first comment by Pavel Lebedinsky:
http://blogs.technet.com/b/markrussinovich/archive/2008/11/17/3155406.aspx?PageI ndex=1#comments
And as one last thought - if the OP tries these changes and has problems, it takes little effort to revert back to the way it was, so there is virtually no harm in doing what I suggested.

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