I was wondering do we need to turn on DEP for all programs or only essential Windows programs and services?
Also, how do we turn off DEP for essential Windows programs and services?
Currently, I haven't seen any issues with turning on DEP fro all processes. I have the setting running on a SBS 2003 and two XP machines (all unknown Optiplexes) and haven't run into any issues.
That said, I'd at least test it. The disadvantage of DEP was performance, but more importantly comparability. It broke a lot of drivers when it first came out (no surprise there). But that was back in the days of XP SP2. . .