hacking into phpBB

Somebody hacked into my phpBB last month and replaced it with some Russian script so I delted the whole thing and installed another one through Fantastico now I find out they hacked into it again last night. I used a very complicated password so no one could crack it, but they did. Is there a flaw in the script? Is there anyway to prevent this from happening again?

 

 

 

 

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