Hi Raj,
I found that the following command works when manually run on the computer
runas /user:%computername%\administrator "powershell.exe -noprofile Set-ExecutionPolicy RemoteSigned -Force"
However, it prompts you for a username and password and there is no way to include the password on the command line.
You can include the password on the command line if you use psexec
C:\psexec.exe -u %computername%\administrator -p AdminPasswordHere -accepteula "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile Set-ExecutionPolicy RemoteSigned -Force
However, I would first have to copy psexec to the target computer. What is the best way to do that?