It looks like the final command that is being run contains an extra set of "" around the executable locationIt looks to be the normal behaviour.
This error code means : "try to install while another install is going on or reboot is pending"
Restart the target computer and try to install again.
If it doesn't works, try to install manually with this command line : wusa.exe Windows6.1-KB2819745-x86-MultiPkg.msu /quiet /norestart
Put Windows6.1-KB2819745-x86-MultiPkg.msu in the same folder than wusa.exe.