[Koha] Mysql

[May Camaron]

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