Hi @anastasia1986dipaulo,
Thank you for using Bitnami. You can find similar cases in this community forum with different options to solve this issue, could you please take a look at them?
Basically you need to modify the memory_limit value in the php.ini file. In Windows, that file is inside C:\Bitnami\wordpress-4.9.5-0\php
Then restart the services
Let us know if that helps