If you're installing software (e.g. Adobe Reader) on a client computer, and it fails, you won't find the reason in the Altiris logs. Youi'll need to examine Windows event viewer for details.
I'd recommend copying the files to a local client and running your command without the /quiet statement, perhaps replacing it with /passive so that it runs without interaction, but alerts you if there's an error. A likely cause is that it's running into an issue during the install, like a reboot required, a pre-requisite not installed, a service not running, an input required, a EULA to be agreed to, etc. etc.