Every time I try and edit a Word document or email or go onto internet explorer the address bar goes nuts repeatedly going up and down stopping me from doing anything. In a document when I write something something takes over and either repeats what ive written multiple times or if i press backspace it will take over and continuesly delete everything before it. I have Macafee antivirus which found nothing and I have used Malware Bytes which also found nothing. My computer is HP Desk Top 8.1. Does anyone know what this problem is?