Software Deployment

Im a noob so please forgive me if i'm in the wrong place.

I need some help in installing apps, such as flash, msn, quicktime etc. unattended.

In my network i have about a 100 computer that needs to be updatet once in awhile, with the lates software.
All computer have 2 profiles, admin and a guest user.
After the update has been installet the computer needs to reboot and copy the guest profil into the default user profil, so all the users that logs on the computer gets the same setup.

We have no sms, ris or other fancy program to do it with.

So fare i got help to make this batch.

@echo off
for /f %%a in (computerlist.txt) do (
net use \\%%a\c$ /user:administrator
copy c:\programmer\chrome.msi \\%%a\c$\programmer
psexec \\%%a -i -u administrator -p pword msiexec.exe /i c:\programmer\chrom.msi
)


It will copy a app to a computer, but NOT install it.

So I put this code in the batch start c:\programmer\chrome.msi
It should start a installation on the target computer/computers, but it only starts a installation on the "push" computer and then it does it twice.??

The problem with the batch is that it ofcause only installs 1 program at a time, and i need to change it every time i need to push out a new update.

I'm i doing it all wrong, is there a better and easyer way to do it.?
Maybe a small program that can do it for me.

I am awear that copying the guest profil into the default user profil, may be a problem.
But if i could do a unattended installation of the new updates on all computer a once, that would be a big help.

any help would be appreciatet [:D]