If you are using a PC with the Windows 7 Operating System you will need to be aware that from the 14th of January 2020, Microsoft will no longer be suppporting this platform.
Microsoft are encouraging you to change to Windows 10 and this will have implications for your PC as well. Simply upgrading your current PC is unlikely to be an option as the old equipment will struggle with the new requirements of Windows 10.
For more information please check out this link to Microsoft - Microsoft Ends Windows 7 Technical Support and Its Implications. This link also contains a section of Frequently Asked Questions on the subject.
(The Microsoft Logo and Windows 7 operating system are Copyright of the Microsoft Corporation.)
UPDATE: PLEASE ALSO SEE - Issues with Old Computers, Old versions of Outlook, Windows 7 and Sage