1) First thing you want to do is find out if your hardware supports W7. Then you need to make sure there are drivers available for W\7
2) Given a choice, you don't want to install both OS's on the same drive - so that's fine. As long as you intend to kill your OS installation at some point, just play around with Windows 7 and if you decide you like it you can uninstall it from the second drive and reformat C: drive at some point down the road and then install it there.
3) When you install the second OS it will install it's own boot loader / manager that will give you a choice of which OS to load at boot.
Edited by Allan, 26 December 2012 - 05:04 PM.