Hi, I have the same problem.

I uploaded all the files. chmod modules/Forums/ to 777. made sure that config.php is not there. However, when I click on the forums link from my portal. It doesn't show me the installation page. Instead it showed me this..

Warning: main(modules/Forums/config.php) [function.main]: failed to create stream: No such file or directory in /export/web20/omega/watzu001/www/modules/Forums/common.php on line 129

Warning: main() [function.main]: Failed opening 'modules/Forums/config.php' for inclusion (include_path='.') in /export/web20/omega/watzu001/www/modules/Forums/common.php on line 129

Warning: Cannot modify header information - headers already sent in /export/web20/omega/watzu001/www/modules/Forums/common.php on line 133