Downgrade from Windows 7 Ultimate to Professional without reinstall?

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Downgrading from Windows 7 Ultimate to Professional without Reinstalling

If you want to downgrade from Windows 7 Ultimate to Professional without reinstalling, you'll need to perform a few steps. First, you'll need to uninstall all of the Ultimate-specific features from your system. Then, you'll need to perform a registry edit, to enable the Professional edition features. Finally, you'll need to install the Professional edition of Windows 7, and activate it with your license key.

It's important to know that you cannot use the same license key for both Windows 7 Ultimate and Professional. If you have a retail license key, you'll need to purchase a new license key for the Professional edition of Windows 7.

The first step in the process is to uninstall all of the Ultimate-specific features from your system. To do this, open the Control Panel, select \Programs and Features,\ and then click on \Turn Windows features on or off.\ In the window that appears, deselect any features that are unique to Windows 7 Ultimate. These features include Windows Media Center, Windows Backup, and Windows Ultimate Extras.

Once all of the Ultimate-specific features have been removed, you'll need to perform a registry edit. To do this, open the Run dialog box (by pressing Ctrl+R), type \regedit,\ and press Enter. This will open the Registry Editor. Navigate to the following key:

HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\EditionID

In the right-hand pane, double-click on the \EditionID\ value. Change the value from \Ultimate\ to \Professional.\ Click \OK\ to save the change.

The next step is to install the Professional edition of Windows 7. To do this, insert the Windows 7 Professional installation media into your computer, and then restart your system. When prompted, select the \Custom (Advanced)\ installation option. This will allow you to install the Professional edition without overwriting your existing installation.

Once the installation is complete, you'll need to activate Windows 7 Professional with your license key. To do this, open the Control Panel, select \System and Security,\ and then select \System.\ In the window that appears, click on \Activate Windows Now.\ Enter your product key, and then click \Next\ to activate Windows.

By following these steps, you can downgrade from Windows 7 Ultimate to Professional without reinstalling. It's important to note that you cannot use the same license key for both Windows 7 Ultimate and Professional. If you have a retail license key, you'll need to purchase a new license key for the Professional edition of Windows 7.

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