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Download the installer
The first step to getting DataStax 1.2 running on your PC is to download the Windows installer for it. The installer provides a positively Windows-like experience: there are no manual steps required, no scripts to run, or anything of that sort. Just run the installer and everything you need will be on your local machine.
To get the installer, head over to http://www.datastax.com/download/community and grab the appropriate installer. The Windows 7 64-bit installer (which also works on Windows 8) is highlighted here.
For your own protection
If you're running the installer on Windows 8, a screen-width message bar will pop up, making it look as if Windows is preventing the installation. The solution is easy, though counterintuitive: clik the More Info link, highlighted here.
The More Info screen is actually where the needed manual override option is placed. Click the "Run anyway" button.