I deleted the path environment variable which had oracle paths and after that my php application cant connect to oracle database... its giving me

Warning: ocilogon() [function.ocilogon]: OCIEnvNlsCreate() failed. There is something wrong with your system - please check that PATH includes the directory with Oracle Instant Client libraries in C:\xampp\htdocs\admin\adodb\adodb-oci8.inc.php on line 149
DB Configuration Error []
Error : Can't Connect to the Database

I tried to define variables again and added the following once
C:\oracle\product\10.2.0\db_1;C:\oracle\product\10.2.0\db_1\bin;C:\oracle\product\10.2.0\db_1\jdk;C: \oracle\product\10.2.0\db_1\jdbc;C:\oracle\product\10.2.0\db_1\jdk\jre\bin\

but no use.. hope someone can help me. I'm on vista using oracle 10.2 for vista.