When I write:
git config --help
Git Bash gives me the error:
/usr/bin/start: line 8: com: command not found
It may be because you did not select the option to add to the Path when you installed git or something wrong happens in the installation.
To verify it:
See if the list shows
C:\Archivos de Programa\Git\bin\git.exe
and
C: \ Program Files \ Git \ cmd
If not, you should add it in new, just copy the routes indicated in the previous step, usually those are the routes where the git is installed by default.
In any case and to save you trouble, I recommend reinstalling it and at the moment that the path option appears to be checked.