1)After opening yazak click on file written on the left corner
2)Go to preferences
3)There click on page no 3
4)Now comes the main part , here in this page do the following
a)Untick room invites
b)Tick on yz emotes
c)Tick on auto send boot bk
d)Tick on refuse any 1 adding me on their list
e)Untick accept yahoo files
f)untick allow conf invites
g)Untick allow voice invites
h)You can allow inf xploits if u want by ticking it.
Now press ok and Your done.
Next go to pm preferences (right side just below chatter list beside scroll on) there click on it a window will appear.
In that window just tick a)no pm b)archive pm on c)return pm bombs.
Then click on done .1 thing , in this very window you will find one option.
Maximum no of pm window at the xtreme right top.
Make the no 5 to 1 .
If u want to pm someone then just untick the pm off.
Now your protected against booters. The ones who are not xperts or dont have a good connection speed.