What should I do if the browser security certificate of win7 system has expired?

Press win r to open the run window, enter mmc, and press Enter

In the window, click on the file and select Add/Delete Snap-in

In the interface, click Certificate → Add

and select: My User Account, click OK

Then find the certificate prompted by the browser on the right and delete it

Finally we reopen the browser , click View Certificate, and then install the certificate - install it to a trusted certificate authority.

Recommended tutorial: windows tutorial

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