Hi, I want to install windows 7 but I'm confused which method I should use to install it. I will be using the Windows OS for mainly to run Visual Studio 2010, Office application. Which method should I use? And I have a questions about the Parallels, would it slow down my mac in any way ,when parallels is not being used (such as loading its components upon system startup and consuming memory in that way etc) ? My computer is a late 2011 macbook pro with 4GB RAM.