custom install of windows 7 from vista

[varuuth]

I currently have windows vista home premium 64 bit installed, can i do a custom install of windows 7 professional 64 bit, or do I need to do a clean install?

 

[gregrocker]

Actually a Custom install is a Clean Install Windows 7. Be sure to boot the installer.

If you are asking about doing an in-place Upgrade then here is A simple guide to a successful in-place upgrade - Windows 7 Forums