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In one of my previous posts, I wrote that one cannot uninstall PowerShell, and that in Windows XP and Vista, PoweShell is not built-in the system, so may be not installed (if not needed). I think, that this may be somewhat confusing, and not quite satisfactory answer.
PowerShell in Windows 7+ is built-in the system so cannot be uninstalled. Yet, in Windows XP + SP2 and Windows Vista it can be installed via updates.

I found some more detailed info about how to uninstall Windows PowerShell 1.0 in Windows XP + SP3 here:
https://support.microsoft.com/en-us/help/926139/windows-powershell-1.0-english-language-installation-packages-for-windows-server-2003-and-for-windows-xp

"Windows PowerShell 1.0 is packaged as a Windows update. If you install a Windows service pack as an upgrade after you install Windows PowerShell 1.0, you cannot uninstall Windows PowerShell 1.0. The service pack upgrade installer removes the uninstallation programs for all Windows updates. This includes the Windows update that installs Windows PowerShell 1.0.
If you install a service pack as an update from Microsoft Update or from Windows Update, the service pack update does not remove the Windows PowerShell 1.0 uninstaller. Only an upgrade removes the uninstaller.
If you have installed a service pack as an update, you can uninstall Windows PowerShell 1.0. However, you should uninstall the service pack update before you uninstall Windows PowerShell 1.0. Uninstalling the Windows PowerShell 1.0 update after you apply a service pack update is considered uninstalling in the wrong order. This might jeopardize the operating system. Updates should only be uninstalled in the reverse order in which they were installed."

So generally, there are problems with uninstalling PowerShell 1.0 on computers with XP and Service Pack 3.

To install Windows Powershell 2.0 on an XP machine, you must have also SP3. Powershell is included in the:
Windows Management Framework, which you can download at: support.microsoft.com/kb/968929
Windows Management Framework Core, which you can download at: support.microsoft.com/kb/968930
Those updates (and PowerShell 2.0) can be uninstalled via Control Panel > Programs and Features > Installed Updates

Deinstallation of PowerShell in Windows Vista:
PowerShell 1.0 --> uninstall KB928439
PowerShell 2.0 ---> uninstall Windows Management Framework Core (KB968930)
PowerShell 2.0 --> Windows Features > Windows PowerShell 2.0 (untick)

I hope this will help.

<blockquote data-quote="Andy Ful" data-source="post: 625193" data-attributes="member: 32260">In one of my previous posts, I wrote that one cannot uninstall PowerShell, and that in Windows XP and Vista, PoweShell is not built-in the system, so may be not installed (if not needed). I think, that this may be somewhat confusing, and not quite satisfactory answer.PowerShell in Windows 7+ is built-in the system so cannot be uninstalled. Yet, in Windows XP + SP2 and Windows Vista it can be installed via updates.I found some more detailed info about how to uninstall Windows PowerShell 1.0 in Windows XP + SP3 here:<a href="https://support.microsoft.com/en-us/help/926139/windows-powershell-1.0-english-language-installation-packages-for-windows-server-2003-and-for-windows-xp" target="_blank">https://support.microsoft.com/en-us/help/926139/windows-powershell-1.0-english-language-installation-packages-for-windows-server-2003-and-for-windows-xp</a>&quot;Windows PowerShell 1.0 is packaged as a Windows update. If you install a Windows service pack as an upgrade after you install Windows PowerShell 1.0, you cannot uninstall Windows PowerShell 1.0. The service pack upgrade installer removes the uninstallation programs for all Windows updates. This includes the Windows update that installs Windows PowerShell 1.0.If you install a service pack as an update from Microsoft Update or from Windows Update, the service pack update does not remove the Windows PowerShell 1.0 uninstaller. Only an upgrade removes the uninstaller.If you have installed a service pack as an update, you can uninstall Windows PowerShell 1.0. However, you should uninstall the service pack update before you uninstall Windows PowerShell 1.0. Uninstalling the Windows PowerShell 1.0 update after you apply a service pack update is considered uninstalling in the wrong order. This might jeopardize the operating system. Updates should only be uninstalled in the reverse order in which they were installed.&quot;So generally, there are problems with uninstalling PowerShell 1.0 on computers with XP and Service Pack 3.To install Windows Powershell 2.0 on an XP machine, you must have also SP3. Powershell is included in the:Windows Management Framework, which you can download at: support.microsoft.com/kb/968929Windows Management Framework Core, which you can download at: support.microsoft.com/kb/968930Those updates (and PowerShell 2.0) can be uninstalled via Control Panel &gt; Programs and Features &gt; Installed UpdatesDeinstallation of PowerShell in Windows Vista:PowerShell 1.0 --&gt; uninstall KB928439PowerShell 2.0 ---&gt; uninstall Windows Management Framework Core (KB968930)PowerShell 2.0 --&gt; Windows Features &gt; Windows PowerShell 2.0 (untick)I hope this will help.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite109" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="Andy Ful, post: 625193, member: 32260"] In one of my previous posts, I wrote that one cannot uninstall PowerShell, and that in Windows XP and Vista, PoweShell is not built-in the system, so may be not installed (if not needed). I think, that this may be somewhat confusing, and not quite satisfactory answer. [B]PowerShell in Windows 7+ is built-in the system so cannot be uninstalled[/B]. Yet, in Windows XP + SP2 and Windows Vista it can be installed via updates. I found some more detailed info about how to uninstall Windows PowerShell 1.0 in Windows XP + SP3 here: [URL]https://support.microsoft.com/en-us/help/926139/windows-powershell-1.0-english-language-installation-packages-for-windows-server-2003-and-for-windows-xp[/URL] [I]"Windows PowerShell 1.0 is packaged as a Windows update. If you install a Windows service pack as an upgrade after you install Windows PowerShell 1.0, you cannot uninstall Windows PowerShell 1.0. The service pack upgrade installer removes the uninstallation programs for all Windows updates. This includes the Windows update that installs Windows PowerShell 1.0. If you install a service pack as an update from Microsoft Update or from Windows Update, the service pack update does not remove the Windows PowerShell 1.0 uninstaller. Only an upgrade removes the uninstaller. If you have installed a service pack as an update, you can uninstall Windows PowerShell 1.0. However, you should uninstall the service pack update before you uninstall Windows PowerShell 1.0. Uninstalling the Windows PowerShell 1.0 update after you apply a service pack update is considered uninstalling in the wrong order. This might jeopardize the operating system. Updates should only be uninstalled in the reverse order in which they were installed." [/I] [B]So generally, there are problems with uninstalling PowerShell 1.0 on computers with XP and Service Pack 3. [/B] To install Windows Powershell 2.0 on an XP machine, you must have also SP3. Powershell is included in the: Windows Management Framework, which you can download at: support.microsoft.com/kb/968929 Windows Management Framework Core, which you can download at: support.microsoft.com/kb/968930 [B]Those updates (and PowerShell 2.0) can be uninstalled via Control Panel > Programs and Features > Installed Updates Deinstallation of PowerShell in Windows Vista:[/B] PowerShell 1.0 --> uninstall KB928439 PowerShell 2.0 ---> uninstall Windows Management Framework Core (KB968930) PowerShell 2.0 --> Windows Features > Windows PowerShell 2.0 (untick) I hope this will help.:) [/QUOTE]

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