New
#11
Its seems as if Deacon is correct it is sticky keys and should be able disable it in Control panel >> Sounds Good ol Microsoft for you. However upgrading your keyboard to a new one would also take care of it.
EDIT: Try typing Make the keyboard easier to use in start >> search once up check and see if sticky keys is enabled. You can also go to setup filter keys and select right shift is pressed for 8 seconds. But just leave sticky keys off. and Try that