Hi quick questions did you also update xampp since updating that may fix problem. Also
what php version are you using. MediaWiki 1.25 supports php 5.3 or higher. And also in
your local settings.php file you may need to either regenerate it so that it is much
easier to update meaning you re generate the local settings file then copying it over to
the localsettings.php file. Also removed when regenerating it by going to the sub folder
w-config that localsettings.php should be temporary renamed so localsettings.php can be
regenerated. Then rename file back and copy over from the new file to the old.