Problem:
When searching PubMed, if you get the following error message: 

Reason:
As of September 1, 2020, NCBI will no longer support connections from web browsers using TLS 1.0 or 1.1. We will need to make sure TLS 1.2 is enabled in the Windows computer. 
Please follow the steps to solve this problem.

Step 1 
Type "Internet Options" in the search box on taskbar and choose Internet Options in the result.

Stpe 2. 
Scroll down to the bottom of the Settings window.
Make sure that the option Use TLS 1.2 is checked.

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Updated: 2020-12-14