anyone know the switches to throw that in with an XP install to have it install silently? It's the arcade pack M$ released a few years back with Pac-Man, Galaga, ect all on it. Any info on this would be appreciated.

Read this topic here...
http://www.msfn.org/board/index.php?showtopic=17940
If its an <unknown installer> then you will have to right click on it and select extract from the drop-down menu and try to extract all files to a temp dir to see if there's an .msi inside it that can be used.
If so see this link:
http://unattended.msfn.org/intermediate/apps/wininstall.htm
If all this produces no results then try running the setup.exe from the command prompt...
>enter
>enter
This might give you a list of available parameters.
If all this fails to produce switches for you then you are going to have to learn how to use AutoIT or beg for a script from one of the AutoIt experts or repack the installer yourself.
Find out what it uses and have a trial. then post back any findings negative or positive here.