The standalone evaluation you downloaded can be configured to run behind IIS but by default it runs as part of Apache Tomcat, which is servlet container similar to the ColdFusion application server. I suggest you that you unzip the contents of the standalone evaluation you downloaded to something like:
and then you should be able to get everything started by double clicking on the 'start-clearspace.bat' file which should live in the c:\clearspace. You should then be able to access / evaluate / setup Clearspace by going to:
If I remember correctly, ColdFusion runs on port 8080, so you might want to stop the ColdFusion service before you start Clearspace.
If you continue to use Clearspace and you want to have it live behind IIS, you'll want to check out the Tomcat connector documentation for IIS: