Não é possível executar o comando Powershell

Question

Esta é a minha primeira incursão no Powershell. Quando eu executo um script Powershell, recebo a seguinte mensagem de erro:

PS D:\modules\setup-azure> Setup-Azure
Setup-Azure : The term 'Setup-Azure' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ Setup-Azure
+ ~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Setup-Azure:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS D:\modules\setup-azure> Setup-Azure.psm
Setup-Azure.psm : The term 'Setup-Azure.psm' is not recognized as the name of a cmdlet, function, script file, or
operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
again.
At line:1 char:1
+ Setup-Azure.psm
+ ~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Setup-Azure.psm:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS D:\modules\setup-azure>

Alguém por favor pode esclarecer a mensagem de erro?