i'm being attacked

hi,

i need some help. i'm being attacked by a bot or something. my daily visits are going up exponentially. here are image captures from my awstats. the first one is where the problem lies. how can i fix this?

http://www.pinchpile.com/s1.gif
http://www.pinchpile.com/s2.gif
http://www.pinchpile.com/s3.gif
http://www.pinchpile.com/s4.gif

thanks

 

 

 

 

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