windows 7 - Run a batch file on a remote computer as administrator

I am trying to run a batch file (to install some software) on a remote computer. To do this, I am using PSExec.

psexec.exe \\COMPUTER C:\swsetup\install.bat

This works fine, apart from some of the installs fail due to the script not running as an administrator (if I log on, right-click and select "Run as Administrator" the script runs and installs successfully.

I have tried running as administrator with the /runas command, with no luck

psexec.exe \\computer cmd

and then

runas /user:computer\administrator C:\swsetup\install.bat

The system flicks up with "Enter password for account" and then jumps back to the cmd prompt without letting me type the password in. The same issue happens if I try and do

runas /user:myaccount@domain.int C:\swsetup\install.bat

Is there a way around this, or am I going to have to visit the machine, log on, and then run the script on each machine?