ANTI spam feature PHPBB2 forum / upgrade

Anti spam feature is needed to be installed on my PHPBB2 forum. You are asked to suggest how this should be done. Because of lots of spam , the forum is offline, you will need to login to the controlpanel of the host and fix the problem. If you can, you may update to PHPBB3 This is what the hosting company send me : Dear Maucriado Dasilva, Thank you for contacting us. The problem is your phpBB forum at the address below: [login to view URL] This is getting hit hard with excessive spam signups. There are a mass of spam signups and profiles. In order to be restored you will need to update to the latest version of phpBB and add spam protection to prevent spam signups, disable the forum, or remove the forum. Reply here when complete for review and restoration. ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform windows vista XP Windows7