You have to be running process explorer (if that is what you are using) as an administrator group user to be able to see if DEP/ASLR is being used, there are by all accounts differences in what OS you are using, XP or Vista, etc.
See image example from process explorer, first part of the image if Vista and the second part is XP, the third part relates to ASLR for avast .dlls and is on Vista as I don't believe ASLR is available with XP.
So Vista avastUI doesn't appear to be running DEP, yet on my XP Pro system avastUI it is running under DEP, I don't know why this is as the Vista images have been captured from another location as I don't use Vista.