Interrupted Cygwin install changed permissions on C drive

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http://www.unix.com – I was installing cygwin on my Windows 7 desktop. I guess I picked a bad mirror site because the download speed was very slow and it wasn't able to give me all the packages I wanted. I closed the setup in too much haste. I think it was still downloading and not yet installing though. It said that closing it would abort the download and installation, roughly, and I clicked 'okay'. Now I try to save something onto my C drive, into Program files or whatever, like a text file or anything. It says that I do not have the permissions to do so, asks if I would like to save into my user documents fold (HowTos)