by Ken Task.
Was the bolded 'shout' of php version taken from phpinfo or just a reminder that's what the php version is ... period ... remote hosting provider has only that version available to it's customers (which would be, I think, unusual).
There have been others with issues installing 2.5.0 Maybe the solution is for you to get the latest build of that version and try it again.
Who is your provider? They offer no assistance on their shared systems? They have no FAQ's or KB that others could view?
'spirit of sharing', Ken