The administrator cannot change/set the Password for new/old users. But your company member if wish to change the AxCrypt account password -he/she to change the AxCrypt password by itself.
after the password change can I decrypt the previously encrypted data?- -Yes, if you change your AxCrypt password, AxCrypt encrypted file are automatically change to your new password.
Both the Password reset and change are not the same. For more information about password change and reset, please check out our blog: https://www.axcrypt.net/blog/password-reset-axcrypt/.
Still, you are asking any Query/issues, please provide more information about the issue and write a mail to firstname.lastname@example.org.