Hi Kathy,
I assume this is a Windows computer? If so, typically when installing an application there is usually a prompt during install asking whether the install should apply to the logged in user or to all users of the computer. In order to make the application available to all users of the computer, you'll want to choose the latter. You may need to uninstall and reinstall the applications so they are available to all users. Some of this will depend on the application you are installing, the OS of the computer, and so on. More details (application, OS) would help.
Thanks,
Jordy