Need to type slowly, or characters are omitted

I recently started using a used notebook computer, which I purchased online.  When I type, some characters are omitted, unless I type slowly.  This is annoying, and I would appreciate suggestions.  The operating system is Windows 7 Professional SP-1, 64-bit.  The other functions seem to work fine.
ddantesAsked:
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Reece DoddsCommented:
What are the system specs of this laptop?
Sometimes, faulty RAM or a hard drives can cause this sort of problem (among many others).

If you go into the device manager, locate the keyboard(s), uninstall it(them) and then restart the computer, does this have any effect on the problem?
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ddantesAuthor Commented:
Thank you.  At the moment, Windows Update is installing updates.  When there is an opportunity, I'll follow the steps you outlined, and post again...
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nobusCommented:
windows update may be the cause of slowness
other than thaat -you can Always test if the issue remains when using an external KBD; and in safe mode
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Do you get the same experience with an external keyboard?
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ddantesAuthor Commented:
Thanks to all Experts.  The issue is resolved, but I misunderstood what was the matter.  I use a USB mouse, which is supposed to disable the Synaptics Touchpad, but it did not disable it.  While typing, if my hand came close to the touchpad, or lightly touched it, the cursor would be repositioned outside of the field where I was typing, or (worse) at an earlier point in the text which had already been typed.  I initially mistook this for omission of characters, but it was actually misplacement of them.  I found a way to disable the touchpad, and typing performs as expected now.
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