Hopefully someone can shed some light on my issue. Recently I noticed that touchpad on my Dell Inspiron 3421 (Windows 8 64bit) becoming erratic when I plug in something on any of its USB ports as if somthing is triggering the problem. I tried using an external mouse and it doesnt appear to be exhibiting the erratic cursor issue but when I switch back to the touchpad it does the same thing again. If you restart the pc a couple of times the problem disapears and again when I tried plugging in the USB cable from my printer it goes back on being erratic. I also tried several devices and the other USB ports available and its still showing the same problem. It doesnt matter if your connected via power supply adapter or on battery it both manifests the same. I tried updating the touchpad driver to see if that would change anything but no changes. Im going to try to find any update for the USB drivers to see if does anything... Has any one experienced this? Any help would do... Thanks!