I had the same problem, the think is i am new at this to.
I selected (or deselected) a list of programs in the "Software Package Installation" to install, but, after reboot, a lot of programs was gone (¿?), so, what i did, insert disk 1 and reboot, ans select UPDATE, and everything comer to normal.....
that's all i know
I did this because i wanted to select some services i didnt find (WEB Serer, Mail server, DNS Server)
do you know how to configure this kind of services?