crazy sql errors on upload!

I uploaded the module to sites/all/modules as per the instructions, but when I went to my modules page in admin to configure the permissions, this showed up:

user warning: Duplicate entry 'sites/all/modules/stringoverrides/stringoverrides.module' for key 1 query: INSERT INTO system (name, info, type, filename, status, throttle, bootstrap) VALUES ('stringoverrides', 'a:9:{s:4:\"name\";s:16:\"String Overrides\";s:11:\"description\";s:48:\"Provides a quick and easy way of replacing text.\";s:4:\"core\";s:3:\"6.x\";s:7:\"version\";s:7:\"6.x-1.7\";s:7:\"project\";s:15:\"stringoverrides\";s:9:\"datestamp\";s:10:\"1221073524\";s:12:\"dependencies\";a:0:{}s:10:\"dependents\";a:0:{}s:3:\"php\";s:5:\"4.3.5\";}', 'module', 'sites/all/modules/stringoverrides/stringoverrides.module', 0, 0, 0) in /var/www/html/drupal/includes/module.inc on line 147.

Please help! I was so close to doing a happy dance, and now I'm sad.