After getting responses for one of my older post, I decided to write a tutorial that might work today.

I installed both Windows 7 Beta and Windows 7 RC1 with UNetBootin (with a little tweak). I was successful to boot WinPE 2, WinPE 2.1 and WinRE 3 RC1 with UNetBootin. I would guess Windows 7 RTM will have no problem either.