Microsoft has an informative FAQ with numerous links for Windows 7 as support ended January 14, 2020

Microsoft made a commitment to provide 10 years of product support for Windows 7 when it was released on October 22, 2009. This 10-year period has now ended, and Microsoft has discontinued Windows 7 support so that we can focus our investment on supporting newer technologies and great new experiences. The specific end of support day for Windows 7 was January 14, 2020. Technical assistance and software updates from Windows Update that help protect your PC are no longer available for the product. Microsoft strongly recommends that you move to Windows 10 to avoid a situation where you need service or support that is no longer available.

What does end of support mean for me?
What should I do?
Can I upgrade my existing PC to Windows 10?
How can I upgrade to Windows 10 for free?
What happens if I continue to use Windows 7?
Can Windows 7 still be activated after January 14, 2020?
Will Internet Explorer still be supported on Windows 7?
Will Microsoft Security Essentials continue to protect my PC after end of support?
What if I’m running Windows 7 Enterprise?
What about Windows 7 Embedded?
Can I move my existing programs to a new Windows 10 PC?
How will Windows 7 end of support affect my Microsoft Office apps?
Why did I receive a notification about Windows 7?