This is my first install on windows 7, so it is quite brief so far.
I used this WAMP server on windows 7
My configuration files for Apache2 are attached (just above) this document.
enable mod_rewrite as it will not work without.
You will also need to enable virtual hosts, as this is the only tested working way so far.
Download the latest tag
Put the coscms/* into your virtual host so that your htdocs points to your document_root
Set correct database user / password / database.
You can also set an SMTP email host, and many other things. But you should be OK by setting the MySQL connection string in the top.
Create a MySQL database according to your config.ini
Run install script
Go to http://dev.localhost/install.php
This will install the complete system (all tables will be created in MySQL database, so have some patience. Then the system will prompt you for creation of an email user.
Ask in the forum if any problems.
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