Hello. I am considering adding a dual boot to my laptop and am hoping for some step by step instruction. I want to maintain my primary OS on primary drive C adopt dual boot have second OS reside on USB key or USB external drive. Normal use I would boot from my primary drive When booting 2nd OS is desired, I would connect my USB drive and boot.. I haves an Asus G2S running VIsta and I have a little Asus EeePC running Windows7 Hope you can help instruct me.