If you do not have Active Directory or some other means of pushing an .msi install to one or more workstations, consider using PSexec.exe from www.sysinternals.com.
PSexec is a part of sysinternals freeware PStools download (http://www.sysinternals.com/ntw2k/freeware/pstools.shtml). After extracting the download, copy PSexec.exe to the system32 folder of the workstation or server from which you will control the push installation.
After starting opening a cmd box, run psexec from the command prompt. Your command may vary depending on what you want to do, but here is an example:
PSEXEC -u context\username \\target_machine -s -i -d msiexec /i "\\path_to_package" /qb
Before putting this to use in a production environment, it is a good idea to read the developer's notes on the download page referenced above, as well as here: