Error received when using a 10g instant client to connect to a database with SQL Navigator. All other products connects without issue:
"Can't initialize OCI. Error -1"
Switch the Oracle binary file to the newer Instant Client Light Edition:
1. Locate oraociicus10.dll from Oracle 10.2 Client Side Install CD.
2. Place a copy of oraociicus10.dll into the Oracle home directory. To find the Oracle Home directory, open a command prompt and type PATH and press enter. The Oracle client home path will contain a \BIN.
3. If there is a file called orcociei10.dll in the home directory, rename it to oraociei10.old.
4. Reboot computer.