Pb with Informix Connect

Hello, I've just installed Informix Connect 2.81 on a Windows XP Pro PC. When I try to connect to a database server with DBPING (Native Connect), I get a -1829 Error message. Established anomalies : 1) DBPING, Native connect tab, Login information section => When I choose my default server in the Informix server combo box and click on the Lookup button I get Informix server "myserver" not found in registry. myserver is declared as default server with "Setnet32" 2) When I input all login informations manually and click on the Native Ping button, I get : Recieved sqlcode=-1829 3) Find Error Utility When I try to launch Find error to get information about the -1829 error message I get the message : Unable to find IBM Informix Error Message file! Check environment variables INFORMIXDIR and DBLANG INFORMIXDIR is well defined in setnet32. All TCP/IP tests are OK. When I try my login information on another PC, all is OK. Any idea ?