Hi, I have just bought a new laptop with Vista Business installed. I want to Downgrade to Windows XP Professional as some of my programs will not run under Vista.
Do I have to buy a Windows XP OEM or can I use the CD I bought with another computer ?
I think I read you can install it with an existing copy of XP Pro but you cannot activate it on the internet but you must do it over the phone.
Do I have to Fdisk and Format the Hard Disk to install XP or is there an option in Vista to downgrade it ?