If that's alright by you, right-click the taskbar and select Properties. Click the Navigation tab. Uncheck both When I point to the upper-right corner, show the charms and When I click the upper-left corner, switch between my recent apps.
To disable all of these corners, forget the instructions above and use the Winaero Charms Bar Killer. When you launch this free program, it goes directly to the notification area. Right-click the icon for options.
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