Can't Connect to INFORMIX DB

Hi, I need some help (or maybe a lot), to get PHP connecting to my Informix DB. I'm pretty new to PHP, and i don't have a clue of what i'm doing wrong. I'm using IIS 4.0 under Win NT 4.0. with PHP 4.2.1 I've tried to connect throw ODBC driver, and directly from native functions but both fail. The messages are: When i use ODBC: Warning: SQL error: [INTERSOLV][ODBC Informix driver][Informix]Cannot open file 'csql.iem' , SQL state S1000 in SQLConnect When i use native functions: PHP Warning: Unable to load dynamic library 'C:\Php421\extensions\php_ifx.dll' - The specified procedure could not be found. in Unknown on line 0 Thanks, Gastón.