Windows XP has reached the end of its support lifetime, after which it can no longer be considered secure and isn’t being updated or supported by Microsoft. It also won’t run Office 2013.
Microsoft says that Office 2016 will run on Windows 7, but recommends that you have the latest possible operating system and updates.
Your older PC hardware should be retired and replaced with Windows 10, and newer hardware should be upgraded. We can help you do this.