Oh my god this is so stupid!!!
i've found the problem.
First of all, dns still doesn't work, but i use IP addresses now and that's fine for me
the problem was McAfee Enterprise 8.
It has port blocking in the on-access scanner ... I set an exception there so that eggdrop.exe can use ports 6666-6669
You can put multiple programs on that exception line, and divide them with a comma ... apparently McAfee doesn't think these 2 lines are the same:
mirc.exe, eggdrop.exe
mirc.exe,eggdrop.exe
AS IF there are executables that start with a space in their name
So the 'Unforseen error 113' will most likely have been the on-access-scan blocking the exe from using that port to the outside
Thanks all for looking for answers with me ... it's greatly appreciated. I'll look into the DNS resolution thingy when i'm feeling really adventurous one day