[Koha] Mysql

Hi, This Beto of the City Mexico, I have installed Koha v. 1.2.3 mysql v. 3.23.51 successfully on windows 98 server machine. The installation was successful. However,when I point my browser http://localhost/ the get the following error : Server error! Mensaje de error: Premature end of script headers: opac-main.pl error 500 The server encountered an internal error and was unable to complete your request. I believe this is a problem with server settings.kindly help me out. I have installed perl correctly in c:\usr. Thanks a lot Beto