I was having this same issue running WIN7 x64, cygwin1.dll version 1.7.9, and no Security Essentials or any other a/v software.
This is how I fixed the issue: I went into my cygwin installation folder (C:\cygwin\bin), right clicked on "sh.exe", selected "Properties", selected the "Compatibility" tab, and checked "Run this program as an administrator". I did the same thing for "bash.exe". Now it works beautifully without any error messages. Hope this helps. PS On "sh.exe" I also have it running in compatibility mode for Win XP SP2 but I don't think it is necessary. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://x.cygwin.com/docs/ FAQ: http://x.cygwin.com/docs/faq/