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Www.mcafee.com/activate - First of all, you should turn your computer system on. After this, you should wait till your computer system turns on completely. Now, you should tap on the start button which is located at the down-left side of your windows desktop. Then, you have to go to the search box which is available in the opened menu. At this point, you should type ‘Windows Update’ in the search box option. Here, you need to press Enter key in order to open the Windows Update window. After this, you should hit on ‘Check for Updates’ in the open window. Next, you have to follow all the instructions just to update your windows with the current updates. Just verify that the user has updated their windows with the latest version of Microsoft XML Core Service or .net framework. When the update is finished, then you should try to do the on-demand scan.