Even though you did kinda "insult"me on the other thread where you requested help in I still offer my support:
my idea is that you shouldnt use ingame/login name on cheaterforums
I suspect it because well who would make a sig extra for maxcheaters with a th on it
Anyways
your mac adress could have been banned, your hdd serial your oem number or your ip
Do you have a external or 2nd hdd?(not 2nd partition on same hdd)
if yes put hb client there delete the system folder redownload it with updater and try to start the game
If that doesnt work->
install vmware ->install windows xp or some shit on it-> copy hellbound client inside and try to run the game from there
if that doesnt work->try to change your mac adress :)
if that doesnt work -> change your ip if you can or try to log over proxy (battleping.com?)
if that doesnt work?
you are -beep-ed XD