Help! Sb3 Seems To Be Possessed

[cricket1001 0]

Please help. My SP3 is really acting weird. I press on Windows icon and screen flickers but nothing opens. I can't exit out of Excel. I can't type with my keyboard. Weird things happen when I try to type. I can't get to shutdown. I could only press power button to turn off. When I turn it back on it still has problems.

 

Thanks