For Internet Explorer, make sure that under Internet Options > Advanced > Reset, the Reset Internet Explorer settings menu item is selected, and press the Reset button.
For all browsers, you should check whether all the browser extensions and plugins are disabled.
Next, make sure that you have all the latest updates for your operating system. For Windows 8 and above, the update is fairly straightforward, but for Windows 7 and below, you need to follow a special procedure (as outlined by Microsoft) that you can find at this web page:
Be sure to update the Windows operating system in addition to your browser and all browser extensions and plugins.
In all cases, it is important to update your operating system and your browser as soon as possible after a change in browser security issues.
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