Final answer:
Periodically reset passwords and require random alphanumeric and special characters to enhance security.
Step-by-step explanation:
One key step to securing employees' computer passwords is to periodically reset passwords and require random alphanumeric and special characters. This helps ensure that passwords are regularly updated and harder to guess or crack. Encouraging employees to use the same password for all databases and platforms, allowing predictable passwords, or storing passwords under the keyboard can all compromise security.