Unable to start oracle database after trying to enable archive log mode on
If there are a bad value in the spfile, you can create a temporary init file and use that.

Login using sqlplus:

C:\&gt;sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Wed Feb 14 09:31:21 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.


Create a temporary pfile:

SQL&gt; create pfile = 'c:\temp\init.ora' from spfile;

File created.

SQL&gt; 


Then you edit that file (c:\temp\init.ora) and remove/fix the parameter for archive destination.  Then you do:

startup pfile=c:\temp\init.ora


to get your database started, and then issue:

create spfile from pfile = 'c:\temp\init.ora';


and you should be good to go.