Lotus NotesSQL Driver - cannot install

was your notes.ini located in the \Lotus\Notes directory ?

NotesSQL expects to find Notes.ini in the \Lotus\Notes directory. If the file is not in this directory, the driver may crash when you use the ODBC Data Source Administrator to create a DSN, or the NotesSQL Authentication List Manager may report that it is unable to find a valid version of Notes. If you must place Notes.ini in a directory other than \Lotus\Notes, add the directory to your PATH environment variable.

I found that adding C:\Program Files\IBM\Lotus\Notes\ (which is what the registry setting HKLM\Software\Lotus\Notes\Path points to) to the PATH works for me.