You don't need to format, but you can't upgrade as that is not a supported
path. Vista Home upgrades to Ultimate, not Business. If you do it without
formatting (providing you have sufficient free space), then the existing
installation and user data will be moved to a windows.old folder on the root
of the drive. You can later retrieve data from this (though it's still a
wise idea to back up data to removable media). You will not be able to
recover user profiles or installed software. You will need to build new
profiles and reinstall software from its original installation media.
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help - www.rickrogers.org
My thoughts http://rick-mvp.blogspot.com
"Priyal" <firstname.lastname@example.org> wrote in message
> M much of windows xp guy but M started using windows vista home edition
> on my labtop and i need to upgrade to vista Business editon as some IIS
> features are missing in home edition.
> Now i got the fresh installation CD of business edtion.While doing upgrade
> do i need to format whole pc? is my data and projects will be lost??
> What is the best way to install?? What things i need to keep in mind while
> Any help will be appreciated..