I'm a silver surfer and feel my PC has been hacked.  I have an Inspiron N7010.  When typing this just now, the whole entry from "...surfer" to "N7010" disappeared before my eyes.  Like others here, my cursor moves around so it suggests I have this sensitivity problem.  However no-one else seems to have the text vanishing altogether.

In addition, I have a small black "cmd" type window  which keeps appearing although I am not doing anything at all with the BIOS, cmd screen or anything else.  Also my data processing light in the middle of the group of three at the front of the laptop is on CONSTANTLY.  I've also had a couple of blue screen crashes recently.  I came back today from a week's holiday having left the laptop at home, and had a message saying I was not connected to the internet despite my BT Hub showing clear blue.  When I looked on the control panel, my setup showed "public internet" where it normally shows my Home network.  I fixed that.

 Sorry if this all seems a bit of a fuss but though I'm 70 now, I use my laptop every day and am getting distressed at the thought that someone else is messing about in my innards, so to speak.  Can anyone throw some light on this for me?  Any help will be much appreciated.

Many thanks.

Stereo Purr