system
10
Do you suggest I leave my Network Shield on?
Yes, extra protection at little cost can’t go a miss now can it 
I am sometimes using AD-Aware SE Personal, will this make any problems for me?
Nope none at all
I am also using dc++ for my downloads, do I have to change settings in either dc++ or Zonealarm, before dc++ will work?
I have never used DC++ myself, but i shouldn’t think you would have to change any settings, best way to find out is to try and use DC++ and if it works, you know nothing needs to be changed in the settings. 
Have a nice day now.
–lee