I can use ctrl or shift, place the mouse and it will copy the paragraph.
Well, can't re-install Internet Explorer, so next logical step would be to try Windows Refresh
At your Start Screen type 'Refresh' and from Settings choose Refresh your PC'. Note, any additional software installed by you will be uninstalled... and if that fails it will have to be full Reset...
Out of curiosity, are you able to highlight text using shift + left/right arrow keys?