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First, try to connect an external USB keyboard & see if it will work fine. If the external USB keyboard works fine, then you will need to replace your laptop's keyboard, as there is almost nothing that can be done to fix a defective laptop keyboard.
This happens because you are landing some part your hand (palm) in the touch-pad when you typing. which activates the touch-pad and makes sudden movements in the pointer.
This problems for lot of laptop users, unless you can get use to prevent the hand from touching the touch-pad, the only option is getting a USB keyboard where you can plug in without any drivers and type without any trouble.
seems to be that you may have accidentally swept some dirt underneath the keys.
try pressing each key individually in word and narrow down the affected key or keys, then remove the affected keys (using a keyboard key removal tool, or very carefully by hand) and clean underneath the key with a small dry clean brush both under the key and the board section it lay in, then replace the key and type the key again, if that has no luck then try the process again.
1. Restart the PC.
2. Hit F12 key repeatedly as soon as the PC turns ON. This will bring up the Boot Menu.
3. Select DELL Diagnostics.
4. Select the Complete / Full from the list of options.
5. Let the tests run which may take about an hour. Make sure you are there in front of the PC for the first 10-15 minutes, because it would need your inputs.
6. This will test the keyboard and USB ports too.
7. This will also verify for you whether the keyboard works when Windows hasn't started.
8. If all the tests pass and your keyboard is still working after sometime, you have issues with Windows: Start you computer in Safe Mode and check the USB drivers and the keyboard drivers.
9. Now, if you continue having issues even when you are running the diagnostics, you need to check your hardware viz. keyboard (try installing another keyboard if you have one) and the USB port.
PLEASE REVERT BACK WITH THE RESULTS. I WOULD LOVE TO HELP YOU FURTHER ON THIS, IF THE ISSUE CONTINUES.