From regedit.exe, in your HKEY_LOCAL_MACHINE/Taldren directory, do you see a directory called "VCScriptAddins" with "Settings" underneath it that contains a key called "ScriptRootPath"? The value of this key needs to be set to the root directory where you have placed the OP API. On my computer it looks like
C:/SFC2 Scripting Development/OP API - R2.2/Scripts