I am using a Lenovo T410i running Windows 7 Enterprise 64 bit. Whenever i am using a web browser (i mainly use Google Chrome but i tried it in Firefox and had the same problem) sometimes i have a problem with the down arrow key. Sometimes when i press it, it beeps 3 times and a window opens on the top left corner of the screen, the same window that will open if u right click up in the top left corner. Its the window for resizing, maximizing and minimizing your window. Along with that, after my next click, my current webpage goes to the previous webpage, basically acting like the backspace key. I have NO IDEA what to do, ive tried looking around Google but cant find anything. This happens randomly, not all the time.
Heres a sample pic
You can get help in the Windows 7 forums - http://answers.microsoft.com/en-us/windows/forum/windows_7
Microsoft MVP Consumer Security - Forum Moderator - Live One Care - Live Mesh - Microsoft Security Essentials