automatically hide rows with zero value

Can you format a worksheet to hide rows that result in a zero value from a
vlookup? For example we have created a report card program and when students
don't have a elective course a "0" is returned. Can this row be hidden
automatically?

Autofilter will allow you to hide rows where a cell contains zero
(select Custom | Not Equal To | and enter zero), but this will be
manual rather than automatic.

Hope this helps.

Pete