I just now got a chance to install Win7 using Bootcamp on my new Retina iMac and have some questions regarding a few things. Every minute or so I see the loading wheel thingy on my mouse arrow like as if something is trying to load or maybe downloading (maybe somethings running in the background causing this?) I also wanted to know if this is something to do with that AMD Catalyst Control Center thing and if theres anyway to make it stop. My other question is upon Bootcamp the welcome screen flashes like twice and it doesn't fill the entire screen I get what I would describe a black frame around it so basically the welcome screen is a bit small and not filling the entire size of the screen. However when the desktop loads everything is normal size. My third and final question is regarding playing 4K content on youtube. I tried to select 4K for a few clips on youtube and it looks like it seems to stop loading after a bit and I'm never able to watch / view / play the clip in the selected 4K content. I have yet to try it out while booted into OS X. Any and all help regarding these issues would be greatly appreciated.