All service packs
Perform a clean install of Windows XP.
Yes, you can. As far as you already have OS of older generation installed you can run the upgrade DVD.
Windows Easy Transfer
You cannot upgrade from XP directly to Windows 7. You must upgrade to Vista first, or perform a new installation.
Yes you can carlos.
No you have to buy it installed into the computer unlike windows which you can upgrade with a disc (I did when windows 8 came out).
No, you cannot perform an in-place upgrade from Windows Vista to Windows 8.1. Microsoft does not support direct upgrades from Windows Vista to Windows 8.1; instead, users must perform a clean installation. This means backing up data, installing Windows 8.1 from scratch, and then restoring data and applications afterward.
If the hardware is compatible and you have enough memory you should be able to purchase an "Upgrade" version of XP.
This will not perform a direct upgrade. It will remove everything from the hard drive and install Windows 7. You must re-install all of your programs.
11/15/09Pg. 520~A+ Guide to Managing & Maintaining Your PC. Sixth Edition. Jean AndrewsISBN-10 0-619-21758-8"If you perform an upgrade, you must begin the installation while you are in the current OS (from the Windows desktop). If you are working from a remote location on the network, you cannot do an upgrade."
Windows 95 can be directly upgraded by Windows 98, Windows 98SE, Windows ME, and Windows 2000. Later versions of Windows (assuming the hardware is suitable) can only be installed with a clean install.
The operating system itself is the same. The only thing is that you need to have some other Microsoft OS already installed on your computer if you want to use upgrade option.