Installation of altiris is roll back from client, how to fix it?
Window Error Event Code - 1618.
It mean another installation is in process, you can try again after some time
ERROR_INSTALL_ALREADY_ RUNNING 1618 Another installation is already in progress. Complete that installation before proceeding with this install.
see this problem description 3, i think you can get the answer
https://www-secure.symantec.com/connect/articles/pcanywhere-troubleshooting-article
Post the altiris failure logs
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https://www-secure.symantec.com/connect/forums/errors-1618-and-1619-when-upgrade-altiris-agent-7-plug-ins