See if this helps
1. Right-click on Taskbar and select Properties option.
2. It'll open Taskbar and Navigation properties window.
3. Go to "Navigation" tab and uncheck following options present in "Corner navigation" section:
When I point to the upper-right corner, show the charms
When I click the upper-left corner, switch between my recent apps
1st option will disable Charms Bar and the 2nd option will disable App Switch list.
4. Apply the changes and it'll immediately disable hot corners in Windows 8.1.