actually the chat client name is chatkiller, its a chat client + booter in one. I got it from an unoffcial site since that chat client is a paid software.

So first you’re downloading a chat client that you can’t verify the author, from a site that ISN’T run be the person who wrote it, and were downloading a pirated copy of the said client, AND it has built in booting capabilities which is probably what attracted you to it.

Normally I would be sympathetic but I find it hard to be given the circumstances. Perhaps you should just consider wiping your system.