Have just had a look at your site. The allow_call_time_pass_reference does not appear critical, but the two orange lines on the bottom are interesting. You have said you are running apache, but the installer is not recognising apache for some reason. Is this your server, or are you using web space on someone elses? If the later you might need to talk to their admin person. If your own, IMHO you need to look at your apache installation. Have you checked your phpinfo() to see what php is recognising?