Lately I've been interested in Desktop modifications, but I don't really know anything about them; where to get them, how to implement them or what possibilities I have. I run Windows 7 (on a macbook (shouldn't make a difference)) and I'm interested in anything really, at least trying new features. My questions are: How much, if anything, will this slow down my computer? What harm can this do to my computer, I'm sure there's something and can I find free open source mods? Thanks in advanced