well i saw alot of people asking about it so i decided to make a tutorial
i know that some people know how to unban ur hardware id but
this tutorial for who dosent know so please dont start flame
if u use windows 7 u must "
Run As Administrator"
then follow the pic's
then
easy cake isnt it?
and now gratz u can join the server agian

dont forget to hit thanks if u think i helped you