Hi Angelica,
Thank you for posting your query in Microsoft Community forums.
From the problem description, I see that some of the Apps are missing from the computer.
Provide us few more information to understand the issue better.
- Which Apps are missing from the start page?
- Did you make any recent changes on the computer prior to this issue?
I can imagine the inconvenience you have experienced. We are here to help and guide you in the right direction.
I would suggest you to refer the article and check if it helps.
What happened to the apps on my PC?
http://windows.microsoft.com/en-US/windows-8/what-happened-apps-pc
You may refer the links for additional information.
Apps in the Windows Store
http://windows.microsoft.com/en-US/windows-8/explore-windows-store#1TC=t1
What to do if you have problems with an app
http://windows.microsoft.com/en-US/windows-8/what-troubleshoot-problems-app
Let us know the status of the issue after performing the troubleshooting steps. If you need any further assistance or information about Windows, I will be glad to help you. We, at Microsoft strive towards excellence.