Hi Carl,
When DEP was first introduced with XP it frequently interfered with legitimate apps. I always make sure that all of my systems are well protected with a top AV that is always up to date, either MalwareBytes or SuperAntispyware scans, and SpywareBlaster. I'm vigilant and aware when it comes to system protection and consider myself a very knowledgeable user. Accordingly I keep UAC on quiet mode and disable DEP. As long as your system is well protected and you are conscientious about keeping it that way, it's my opinion DEP is superfluous. I do not suggest that others disable UAC or DEP, but I don't discourage it for knowledgeable users either. It's completely your call. Personally I think DEP is great for novices and overkill for others.
BTW, since I haven't used DEP for at least 5 years I don't know if MS has done anything to improve its tolerance of apps that may not be as well written as they should be.
Interesting
Nicely put allan, thanks for the quick explanation.
I might consider turning it of myself, i am well conscientious, and aware of what sites i visit, plus i do regular scans with malwarebytes, and avast .
You mention " i keep UAC on quite mode " can you tell me what quite mode is, sounds a bit like a registry tweak.
I am so used to my standard account, i don't bother much with the admin account, i just normally put up with the prompts, but i am not sure how quite mode works on a standard account, sound interesting though..