How to deal with software deployments requiring reboot?

Hi,

We're overhauling our Office deployment and one of the issues we face is that whilst running through the deployment process (uninstalling previous Office versions) a reboot is required. This poses an issue if, say, trying to roll this out in the evening - the software uninstalls but would only reinstall when the user next logs on - not an ideal experience.

I'm interested to hear how some of you approach this problem where a reboot is required and the installation cannot proceed beyond the disk encryption login screen at boot.

thanks,

Baronne