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Automatic or manual?
Are you going to be using Cassandra frequently? If so, have the services run automatically. But if not, then uncheck the two options shown here. This way, everything will be installed, but it won't run unless you explicitly start it up. Once you've made your decision, click the "Next" button.
See installer run
The installer should now run without further necessary interaction.
Start the services
If you elected to have the services run manually, then you will need to launch Windows' Services applet and scroll down through the alphabetical list to the three DataStax services. One-by-one, click each service and start it. You can start the service through its context menu or by clicking on the "play" VCR-style button on the toolbar. Once all three services are running (they should display "Running" in the "Status" column), you're ready to start working.