When you try to upgrade the operating system on a computer that has Windows PowerShell 1.0 installed, the upgrade fails. Additionally, the Compatibility Check feature displays the following message:

You must make the following changes before upgrading Windows:
Uninstall the following program:

• Windows PowerShell

Consider the following scenario:

• You have Windows Vista Home Basic installed on the computer. Or, you have a similar version of Windows Vista installed on the computer.
• Then, you install Windows Vista Service Pack 1 (SP1) on the computer.
• Then, you try to upgrade to a version of Windows Vista that has additional features. For example, you try to upgrade to Windows Vista Ultimate.
• To perform the upgrade, you use Windows Vista media that does not contain the updates that are included in Windows Vista Service Pack 1.

In this scenario, you receive the following error message:

The upgrade cannot be started.

Then, you receive the following error message:

To upgrade, cancel the installation and then choose to upgrade to a version of windows that is more recent than the version you are currently running.

Note: This issue may also occur when you use the Windows Anytime Upgrade feature to upgrade Windows Vista.

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By going to a special webpage while in reduced functionality mode you can upgrade to SP1, which will get you out of that mode. Note that you can’t uninstall SP1 when upgrading with this method. Keep reading →