Steps to Install a Certificate on a Window Server
Right-click on Windows button at the bottom left corner and select Run.
Type in mmc and click OK.
On the new Console window menu, click on file and select Add/Remove Snap-in… or press Ctrl+M.
Select Certificates and click on Add > button. Select Computer account and click Next.
Click on Local computer and click Finish. You should see Certificates (Local Computer) on the Selected snap-ins: pane. click OK.
Under the Console Root on the left pane, expand on Personal, Certificates.
Import the certificate (pfx file) from Local Machine and click Next.
Select the certificate file from the local folder and click Next.
Type in the password for the certificate and check on Include all extended properties and click Next.
Check on Place all certificates in the following store – Certificate store: and type in Personal if it’s not already filled in. Click Next.
The Certificate Import Wizard will confirm all the selection. If everything is correct, just click on Finish and you should get a confirmation that the import was successful. Click OK and you’re done.
Please keep in mind if you’re installing this certificate for a website on IIS, you still need to assign the certificate to the corresponding website on IIS.