Today I had to install Windows 7 on a new machine I put together for the office. I've installed Windows many times, XP, Vista and more recently 7 countless times. Every time had gone smoothly and no issue at all. This time though, the machine would get stuck on Setup is Starting. This was very unusual and I thought if I'd leave it like that while I had to build the other machine it would go away. No dice, it was still there stuck on the beautiful page that said "Setup is Starting".
So I searched as always in Google and there were a couple of solutions floating around. Disconnect all USB, disable USB in the BIOS, etc. In the end it's all about the Legacy Floppy drive. I found my answer here.

On the ASUS motherboards I bought they were both enabled by default and this is what made it hang up. As soon as I disabled the Floppy Drive on the BIOS all issues went away. So if you're building your machine with an ASUS motherboard make sure you disable the Floppy and you're good to go.  

Hope this saves someone a headache.