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If you have Oracle 10 installed on a Windows computer, you have oci.dll.
If "oci.dll can not be loaded", the problem is not a lack of oci.dll.
The first thing you should do is uninstall Instant Client and anything else you installed to fix the problem (I don't know what you mean with "install PL/SQL").
Then check if oci.dll can be loaded, e.g. by starting sqlplus and connecting to a database.
If that works, oci.dll is fine.
If your program cannot load oci.dll, something in your setup has a problem.
Maybe it cannot find oci.dll and you have to tell it where to look.