[php4][Inst] Please help with extensions

Hi - everyone I have been trying for hours to get the php_interbase.dll to talk with php. The error that it shows is as follows "Unable to load dynamic library 'c:\php\php_interbase.dll' A device attached to the system is not functioning" Could anyone please give me an idea as to where I am going wrong this is what I have done to the .Ini { extension_dir = c:\php;./ extension=php_interbase.dll } I am running under win98 using PWS. I am sure that it is something simple that I am Missing, but what I do Not Know Thanx Morne