1- Check version.
2- Download latest: http://us.blackberry.com/apps-software/desktop/
3- Copy to portable drive.
4- Upload and install at work.
6/29/11 - Saving the below from the Blackberry Support Community in case the above doesn't work. It looks very thorough:
Re: Blackberry Curve 8330 and Desktop Manager v5.0
by sdgardne, VZN network