Running exe file on mapped target pc

Hello,
I’m trying to write a script to update the virus scan enging on all our client computers. I can map to each computer and copy the upgrade exe file to the target computers. However when I command the file to run it updates the scan engine on the server where the script runs from and not on the target computer. How do I get my script to run on the target computer. I cannot use a logon script as the exe file needs admin rights to run. The script is shown below. Many Thanks.

net use q: \\bloggs\c$
xcopy c:\4150eng.exe q:
q:\4150eng.exe /silent /f /prompt
del q:\4150eng.exe
net use q: /del