psexec is a Microsoft tool that allows you to execute windows command line commands remotely. Just as a note the commands dont work locally on the computer either. What I do on psexec is get the commands working on the commandline first then just prefix it on psexec and they work. this however doesnt even work properly from the command line locally on the machine.
So for example if on the machine itself I go to the commandline and enter msiexec /i "\\data\patches\AdbeRdrUpd1014.msp" /qn /norestart
I get the same problems.