Powershell – How to turn windows features on or off using powershell or commandline in windows 7

You can use certutil.exe. The exact syntax varies based on the the certificate file format (.cer, .pfx...), but one of these options should be able to do the trick:

certutil -addstore my <filename>
certutil -installcert <filename>
certutil -importcert <filename>
certutil -importpfx <filename>

More info here: http://technet.microsoft.com/en-us/library/cc772898(WS.10).aspx.

This also can be done in native PowerShell, but it's a lot more complex, as there is no built-in command for certificate management, so you have to use the .NET X.509 library (System.Security.Cryptography.X509Certificates).

Probably not the answer you were hoping for:

When you use *-BitsTransfer cmdlets from within a process that runs in a noninteractive context, such as a Windows service, you may not be able to add files to BITS jobs, which can result in a suspended state. For the job to proceed, the identity that was used to create a transfer job must be logged on. For example, when creating a BITS job in a PowerShell script that was executed as a Task Scheduler job, the BITS transfer will never complete unless the Task Scheduler's task setting "Run only when user is logged on" is enabled.

From MSDN, where it seems like it's not possible...