How to stop spam bots?

[yashmahala]

This user has been denied support.

Hi.
Mybb is good becuase of its easyness and look.
But i'm getting unknown spam bots on my forum www.grandcodes.org .
My original user number is about 200 and spam bots registered 1200+ id's.
How to ban these stupid bots and keep my forum clean, help me plz or give me any forum software name which prevents spam bots.
(don't say smf,,it's also same)

[kavin]

Not eligible for support as your Forum don't have "Powered by MyBB" copyright.

[Alan S.]

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