I believe there's an issues between the IRC client and evilzone.org. I've registered my nick with the server and if I use my nick on entering the IRC it asks me to identify myself (within a minute I think) and I don't get booted. If you have this problem continuiously then it may be a good idea to install the "chatzilla" for Mozilla Firefox (if your using firefox that is.

Or you could try registering via IRC client software or through the web client (if it lets you). Go into the IRC using your desired nick and then register it using:

/msg NickServ REGISTER [password] [your@email.address.com]

They will send you a confirmation email, Then identify yourself in irc using:

/msg NickServ IDENTIFY [password]

Yeah there's an ongoing problem with the client and evilzone I think. I'll speak with Xinapse tomorrow about it as it's like 5am lol