Did you have a previous version of the shoutbox plugin installed before and did you deactivate it beforehand?
It looks as though the shouts table already exists, so firstly I would try removing the table manually through phpMyAdmin or a similar database administration tool. I can provide further instructions on how to do this if needed?
It looks as though the shouts table already exists, so firstly I would try removing the table manually through phpMyAdmin or a similar database administration tool. I can provide further instructions on how to do this if needed?