Discontinue using Internet Explorer as a general-purpose browser. IE should only be used with trusted websites that require it. Use Firefox, Safari, Chrome, or Microsoft Edge.
A new vulnerability affecting Internet Explorer 9, 10 and 11 is being actively exploited on all versions of Windows (including the now unsupported Windows 7 and Server 2008). The vulnerability can be exploited by a malicious website, and will not be patched until mid-February, possibly later.
Successful exploitation would result in the ability to execute code on the affected system, under the privileges of the currently logged in user. More importantly, as of early 2019 Microsoft does not recommend Internet Explorer as a general-purpose browser, but rather as a compatibility tool for applications that require it. Although Internet Explorer 11 will continue to receive updates, it should not be used as a primary browser.