Restoring Chrome OS on CR-48

Hey, I got a CR-48 off of eBay with Windows 7 preinstalled. However, the touchpad drivers don't work well on Windows, it's more prone to viruses, and it takes up most of the SSD. Is there an way to restore everything back to Chrome OS?

I didn't find the right solution from the internet.
References:

http://www.techist.com/forums/f43/269962/

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