Not able to renew windows developer license on Surface

Hi,

I was sideloading my apps on surface and testing them.

but my developer license got expired on 25-Jan-13

when i tried command Show-WindowsDeveloperLicenseRegistration it gave error as "you need administrator privileges to acquire or remove a developer license.

But i am the administrator on my device.

I tried rebooting device,it couldnt help..

How to run powershell as administrator and help me fix this issue.

Thanks 

Yashavantha G M