It might but most likely it will not. You might even get a warning state that you are trying to use different installation disk.
you can not degrade.. you have to do new installation
it has start up repair option that vista did not have
you will have to boot up your computer from the windows 7 DVD and repair the installation (I guess its called startup repair). OR If you have Windows XP installed on the same PC, then use Vista Boot PRO (Totally free) to restore Boot manager info to your windows 7 partition
Yes
yes
Yes by buying a window vista installation CD.
You can not simply downgrade to Windows XP from Windows Vista. If you want to completely remove Windows Vista in favor of XP, you will have to format the hard drive and reinstall the OS from scratch. Windows XP will not install on top of an existing Vista installation.
You can update to Windows 8 by purchasing a Windows 8 installation disk but make sure your hardware can support the update.
The default desktop theme for a successful installation of Windows Vista Business is Aero. I hope this answers your question :-)
Only Windows Vista, Windows XP PROESSIONAL, and Windows 2000 Workstation clients can process the software installation policy.
...with Windows XP Professional already installed on your computer. Windows Vista cannot be installed without Windows XP Professional installed first on your computer, it's the same with Windows 7; Windows' latest operating system (OS).
HCL