Ok... I wouldn't do this. After playing around with it all day, I discovered. Your just gonna make a mess.... And my netbook is running 10x better then it did with 7. So If you wanna play around with it, otherwise I wouldn't recommend wasting your time.
When it comes to fonts you are better off leaving them alone. There was a hack that changed Segoe UI to Tahoma but it made a mess of my themes so I changed it back.