Windows update and keyboard problem

Hi Guys, new in town.
After a recent windows update I tried to enter my password at logon but then the keyboard seemed to take on a life of its own and began entering random dots until it ran out of space.
After about 8 reboots I managed to logon but then, in IE, I began entering text into the Google searchbar and the keyboard went off again, entering a line of 2's until it again ran out of space. Any help would be most appreciated.

If only life were that simple. It's a desktop pc, the keyboard is in good working order and the same problem occurred with a different keyboard. There's something more sinister afoot!