Find Out if an Update, Hotfix or KB is installed on a Windows Server Using Powershell

In Powershell versions 2 and above you can use the get-hotfix command to determine whether a particular update, KB or hotfix is installed on a Windows Server or client. Simply open Powershell and run the following command:

get-hotfix -id KBxxxxxx

Where KBxxxxxx is the name of the update you wish to search for.