any help? pls...? a idee to resolve that?

I work to my website in localhost and after install the component he give a error

Server error!

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there was an error in a CGI script.

If you think this is a server error, please contact the webmaster.
Error 500
localhost
03/20/10 02:52:37
Apache/2.2.9 (Win32) DAV/2 mod_ssl/2.2.9 OpenSSL/0.9.8h mod_autoindex_color PHP/5.2.6

Can someone to help ! Thanx ( and sory my bad english )