ok then ... sounds like you might have a key stuck down ... clean the keypad and tap each key several times ... do this with it powered down. When you power it up make sure all of the keys work.
Another thing to check might be that the laptop is currently running the cpu at maximum ... slowing down the response rate of the keyboard.
Hit CTRL ALT DEL and run Task Manager ... hit the third tab across the top called "Performance" and see how much your CPU is loaded up ... if it is hovering around 100% all of the time then you might have your problem identified.
Check for malware and viruses.