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left behind by the previous OS. “Perhaps this was why everyone hated Vista,”

Microsoft reasoned, “so we’ll just disable the upgrade feature in Windows 7.”

(Or maybe building an installer that actually worked was just too much

trouble.)

Whether you’re allowed to install Windows 7 over an older

version or you’re forced to perform a “clean install” is unre-

lated to the special pricing or licensing you may’ve gotten

when you purchased Windows 7. In other words, just because

you got an “upgrade” version of Windows 7 doesn’t mean you

can do an in-place upgrade over Windows XP.

So, can you do an in-place upgrade? If you have Windows Vista or a lesser

edition of Windows 7 (e.g., Home Premium to Ultimate), see Table 1-2 to find

out. If you have any other operating system, then the answer is no. Frustrating

to be sure, but trust me: Microsoft is doing you a favor.

Table 1-2. Allowed Windows 7 in-place upgrade paths; no checkmark (✓) means you must

perform a clean install

Windows 7

Home Basic

Windows 7

Home

Premium

Windows 7

Professional

Windows 7

Enterprise

Windows 7

Ultimate

Vista Home Basic ✓ ✓ ✓

Vista Home Premium ✓ ✓

Vista Business ✓ ✓ ✓

Vista Enterprise ✓

Vista Ultimate ✓

XP or earlier

Furthermore, if you want to switch from 32-bit to 64-bit or vice versa, you

must do a clean install. You’ll also need to install clean if you’re changing the

core language, installing a hobbled version of Windows 7 (e.g., Windows N,

Windows KN, etc.), or are upgrading from any beta or release candidate.

Install Windows 7 | 9

Get Started with

Windows 7

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