U r keyboard is likely to b defective or ur ram..
lightly strike/tap the keypad using ur hand..
if u r a professional, open the keyboard..deep clean all the carbon contacts beneath the keys using Iso-Propyl alcohol..put/stick 'Carbon-Dots' (available in cheap level spare market) as n where necessary..
also look if there is any Fn or Fx key present..check n disable all Accessibility optiions from ctrl-panel..
hope it'll work..
better to seek professional supervision esp of ur system admin/vendor....
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