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If you have phpMyAdmin installed or part of your hosting package, go to the modules table, click on browse and look for the module you are talking about and delete it. if you find a module that doesn't have a name delete it. If you don't have phpMyAdmin there is a module in XOOPS that you can use. that should work. What module are you trying to install? Also check the permissions of all files in the module.
hope that helps.