HTTP 500 Internal Server Error (need help)

[ab2007]

I have intermediate PHP which is active. I installed SMF from the fantastico de luxe menu in cpanel. Everything went fine no errors. I try to go to my forums http://alpine07.exofire.net/forums/ and no matter what i try it just comes up with http 500 internal server error!

I need help

Can anyone shed light on the situation??

Thanks in advance,
Ben

[Thewinator]

Its working fine here...
Edit: Have you got a null byte in your username? %00 or \0