Thank you for your fast response, scanning for the file has provided us with the information we required.
Just curious, our initial file scan parameter which did not find the file was
%systemdrive%\WINDOWS\system32\msiexec.exe
However, using parameter C:\WINDOWS\system32\msiexec.exe worked fine. Is this a syntax error on my part?
Thanks again for your very fast response, Lansweeper has once again proved to be very useful!
EDIT: Ah, my fault for not reading the documentation, I realise now that I could use %Windir% as the parameter variable.