concrete5 will not install

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I use dreamhost and install via the "one click install" method. I have concrete running on a few of my pages and have never had a problem, but my newest site is bugging out. When I try to install it gets to "installing dashboard" and then it hangs and eventually gives a "internal server error" and only allows you to go back but then it tells you that "125 files are already in the database" so it won't install. I have deleted the databases. I have deleted concrete from the server and done a fresh install. I have shut down my browser (firefox) and loaded it fresh- everything gives me the same install error. Help?