I did install the oracle enterprise odbc. (win32_11gR1_database_1013.zip) which is almost 2 gb to download. I'm not 100% sure if this is the one I used last time?.
If I remember correctly, I also had to include additional files (sqlnet.ora and tnsnames.ora) created in notepad, to be place in a specific folder. On another computer that currently has connectivity, the location is "C:\oracle\ora92\network\ADMIN", which is somewhat different than what was installed on my system with the above enterprise edition.