From within Windows Vista, insert the Windows 7 Setup DVD and choose Run from the AutoPlay dialog.
Choose Install Now.
Always go online to get the latest updates. Doing so will result in a better install experience.
Accept the EULA (end user license agreement).
Choose Upgrade from the installation type screen.
At this point, an integrated version of the Windows 7 Upgrade Advisor runs behind the scenes and tests your PC to see that it meets the Windows 7 system requirements and that your hardware and software is compatible with the new OS. There are a variety of issues that can come up at this phase of Setup, including issues that may cause Setup to end prematurely. Some issues are minor. For example, if you are upgrading from Windows Vista Ultimate, Setup will inform you that Windows Vista Ultimate Extras have been discontinued and that these tools will no longer be available after the upgrade.
Setup will alert you if any currently installed applications are incompatible with Windows 7 and, in some cases, recommend reinstalling these applications after the upgrade for best results. Other issues are more disruptive. If Vista is waiting on a Windows Update-based reboot, for example, Setup will halt and inform you to reboot before trying again.
Once you've passed muster with the Compatibility Report, you'll be confronted with the familiar Install Windows phase of Setup. This works identically to the same phase of Setup during a clean install, but with one important change. In addition to the Copying Windows files; Gathering files, settings, and programs; Expanding Windows files; and Installing features and updates steps, you'll see an additional step during an in-place upgrade. It's called Transferring files, settings, and programs, and this is the part that takes a number of hours to complete. Because of the variable length of this part of Setup, it provides a continuous update to its progress.
During Setup, you PC will also reboot a number of times. When that's finally done, you'll enter into a shortened version of the post-Setup tasks you perform during a clean install. You're aked to input your product key (which is optional), configure Automatic Updates, review time and date settings (which, unlike with a clean install, should already be correct), configure a network locations (Home, Work, or Public network), (optionally) and configure HomeGroup sharing.
When that's done, Setup will prepare your Windows 7 desktop.
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