domain account to install programs

You don't have to go to every PC. With 150 PC's you can do the following in about a half hour.
Create a Global Group called "installers" put the members of all the people you want to be able to install programs in that group.
Now from AD Users and computers, right click each computer object and select manage from there you can add the "installers" group to the local Admin or powerer user groups for each Box.
Now all you have to do is adjust the membership of the "installers" group, to give install permissions on all workstations.
Now if you use Imaging software, pre add the installers group to the setup PC before you Sysprep, then you won't have to do it manually anymore.
You can also do it through scripting, but with 150 PC's I thing it would be faster to do it throu AD users & computers. I add my "Tech" group to the local administrators group so my tech department are Local Admins

I know you stated that you have 150 computers in a domain ,but I am wondering if you are considering your network a domain without actually haveing AD installed on it . The only reason I am asking is because you are talking about local computer accounts. If you are on AD you should be able to just publish or assign the .msi file to an object group with the computers you wish to install the file in that group. Now if you are running AD and just want to do something locally , please forgive my intrusion.