Upgrading a Previous Windows Version

To perform an in-place upgrade of your existing copy of Windows, you must be running either Windows Vista with Service Pack 1 or later installed or Windows 7. The installed edition (32-bit or 64-bit) must match the upgrade edition; you can't install 32-bit Windows 7 over a 64-bit Windows installation or vice versa. Finally, you must have enough free disk space to accommodate the new installation of Windows 7—typically, 15 to 20 GB. The exact upgrade paths available are listed in Table 2-2.

Table 2-2 Supported Paths for In-Place Upgrades from Windows Vista

If Your Current Operating System Is

You Can Upgrade To

Windows Vista Home Basic

Windows 7 Home Basic, Home Premium,

Ultimate

Windows Vista Home Premium

Windows 7 Home Premium, Ultimate

Windows Vista Business

Windows 7 Professional, Ultimate, Enterprise

Windows Vista Ultimate

Windows 7 Ultimate

If you want to upgrade your existing copy of Windows XP to Windows 7, you'll need to jump through a few hoops . Direct upgrades from Windows XP are not possible, so you'll have to perform a clean installation . You can use the Windows Easy Transfer utility to

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