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You may need to remove the block from showing on your site. It looks like a module specific problem. You can do this through phpMyAdmin and looking for where the call to the block is being made and delete that call. Renaming the folder will not remove the instances from your DB so you may need to do some pruning.
You might be able to log into your site by going to
http://www.yourdomain.com/user.php and then you can go into the admin by going to
http://www.yourdomain/admin.phpI suggest removing the offending module and looking up the authors sites or comments on suggestions on how to fix it, if it is fixable at all.
Also, it is likely this module was writen for an earlier version of XOOPS that is no longer supported.