probably when you were dling and installing the the client your anti-virus detected a file as a "harmful" threat,

possible solution: turn off firewall and anti-virus and install client.

If not try this :

Go to your GunZ folder and open a file called "mlog"

find this line

Wfog Enabled Device.

Under that line it should say:

device created.

If it doesn't say that then go to start>run>msconfig>click on the startup tab>click disable all>click apply>click okay>restart your computer>run your internet connection>run the gunzlauncher>click start game

If That also doesnt work then give me a call I'll try to figure it out

That gave me a hella hard time when I first started playing private servers. >.> (I hte anti-virus' :])

avg gives out hardest times for p servers....gunz, maple story, etc.

They ignore everything XD