PsTools : How to execute a batch file on a remote computer?

I have a VBA procedure that loops through many elements in an array.  This used to work fine on a XP machine, but it was just upgraded to Windows 7, and now it doesn't work.

Shell ("psexec \\" & rCell & " C:\Windows\post-script.bat")

rCell is a name in a name in an Excel Cell. 

I've tried a bunch of things.  This looked promising, but didn't work.

Set objShell = CreateObject("wscript.shell")
objShell.Run ("runas /user:domain\administrator psexec \\" & rCell & " C:\Windows\post-script.bat"), 1, True

I tried this as well:

Shell ("psexec \\" & rCell & "-u " & rCell & " -p [password] /accepteula -h cmd /c" & " C:\Windows\post-script.bat")

It's still not working.

Has anyone tried this and gotten it to work? If so, please do share!!