Here’s a quick solution which allows you to open a powershell instance as an admin from command line.
In my case i was locked from using start menu, or even right click would lock my system and i needed to run a SFC as admin.
Open Powershell first:
Open Run (start menu or winkey + R or via task manager)
PowerShell to spawn a PowerShell session.
Once the session is open:
Start-Process PowerShell –Verb RunAs and press Enter.
That will open a new Powershell process as Administrator.
You should now be good to go with whatever you needed to run as an admin.
I tested this on windows 7 and windows 10. If it worked for you please let us know.
If anyone knows how to spawn a command prompt as admin from a normal command prompt please share!