Since last month, I have been using a new Macbook pro and I have installed Windows 7 on it via Boot Camp. But until now, I have run the Windows for just once cause I found it useless while the Mac OS X is really sufficient for my daily usage. When I was wondering should I remove the Windows, my friend told me don't cause he said it would be useful when I need it. However I observed that the Windows take up a some of the storage in Mac which is originally 512MB. So, I want to ask that how to remove all the cache in Windows but keep the system?