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I am trying to install the latest Cygwin. Even when I accept almost all the settings default values, it fails to set up, saying:

can't open C:\cygwin/var/log/setup.log for writing

I run Windows XP SP2 Professional English and am the administrator (and choose the same account for Cygwin). Is that "/" pair in the path the reason for the problem and how do I fix it?

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What version of windows? are you selecting to run as administrator? In vista and 7, even if you are admin, they do not run installers with elevated permissions. – MaQleod Sep 8 '11 at 22:43

Try deleting the Cygwin folder C:\cygwin and reinstall.

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