Problem with laptop keyboard

When I start my laptop last icon of the desktop is automatically selected. When i click on other icons only the last icon is opened. I can open the icons if i press the ESC button and Windows key, and then refresh. But it is limited to some time only. Also webpages are scrolled down automatically till the end. I visited Lenovo service center. they told me that my Windows is corrupted so I installed Windows again but again the same problem occurring. somebody told me that I might be having problem with my laptop keyboard. Please suggest me.