Use an alternate chat client like Y Tunnel Pro (assuming ur getting booted from chat). Also check the box next to ignore anyone not on my list option in Preferences>>Ignore if ur getting bombarded with countless IM's which make ur comp crash. If u don't wanna do this then look for an option where all msg's from ppl not on ur list are shown in a single window. But sometimes those idiots just close ur chat window and sign u out of Messenger and bombard ur id with boot codes which prevent u from signing back in.... to avoid this use Y! Tunnel Pro (u should know how to get it) It will provide the best possible protection against booters.