PowerShell v1 RTM shipped as updates to the OS. Therefore, it will show up only in the updates section. To look for previous versions, do the following:
On Windows XP/Server 2003:
· Go to Add/Remove Programs
· Select Show Updates
· Look for any of the following KB numbers which indicate earlier versions of PowerShell
o KB926139 – Windows PowerShell v1.0 RTM – English Language Version
o KB926140 – Windows PowerShell v1.0 RTM – Localized Installation Package
o KB926141 – Windows PowerShell v1.0 RTM – MUI pack
o KB925228 – Windows PowerShell v1.0 RC2
· Versions of V1 prior to RC2 are MSI based installations and they will appear as Windows PowerShell in the programs list
· Uninstall the previous version that's installed
On Windows Vista:
· Go to Programs and Features
· Click on View Installed Updates
· Look for any of the following KB numbers which indicate earlier versions of PowerShell
o KB928439 – Windows PowerShell 1.0 RTM
o KB923569 – Windows PowerShell 1.0 RC2
· Version of V1 prior to RC2 are MSI based installations and they will appear as Windows PowerShell in the installed programs list
· Uninstall the previous version that's installed
On Windows Server 2008:
· Launch Server Manager
· Go to Features
· Click on Uninstall Features. This brings up a list of installed features to choose from
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