Cliente Oracle8 + Apache + Windows + PHP4

Hi, I'm trying to connect with my Oracle server and i'm having some problems... When I try to connect using OCILogon raises an warning:"Warning: Oracle: Connection Failed: ORA-12154: TNS:could not resolve service name in c:\arquivos de programas\apache group\apache\htdocs\index.php on line 25" I don't no what is wrong... I visited php.net site and saw I have to set some environment variables like ORACLE_HOME, ORACLE_SID, LD_PRELOAD, LD_LIBRARY_PATH, NLS_LANG, ORA_NLS33... I don't no where I can declare these variables... Faz alguns dias que tento fazer isso e não encontrei ninguém que pudesse me ajudar. Espero, aqui, encontrar uma solução...