well...
first, I think the best way to deal with this is to display no info whatsoever.
let the install go on on itself hidden.
and even better, even keep your logonscript hidden.

now, if you really must have the console window open and you really really wanna show the user something...
you need to find out how to call the installer in such manner that it halts the script execution.
for many installers, simple shell line will do:
shell "%comspec% /c start /wait installer.exe"

but, for spybot, search the board or spybot technical articles.
think it's descriped in both.
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