Random/Mysterious Cursor Movement While Typing

Ok. I have a user with a:
Dell Latitude E5520
Win 7 x64
4GBs
Using Firefox and Office 2007 Suite
Less than 3months old

Starting on 10/6/11 her cursor started randomly and mysteriously moving to a new typing position while she would type.  This has been confirmed to happen both in a web broswer (gmail, or web page), and microsoft office (word, excel).  Sometimes this happens a lot other times it happens very infrequently.

What I Have Tried/Know so Far:
1. disabled dell trackpad software utility - this software is a utility to enhance the trackpad and pointing stick.  I started by disabling individual components inside the software, then I disabled every component of the software, and lastly I uninstalled the Dell Track Pad Software (removing this software does not disable use of the trackpad and pointing device).
2. I turned off the "enhanced pointer precision" option under the Pointer Options Tab on the Mouse Properties screen.
3.I confirmed that "hide pointer while typing" DOES have a check in the box (option located on the same tab listed in #2).
4. Confirmed that the mouse drivers are up-to-date.  
5. Even though the Dell Trackpad software has been uninstalled the trackpad and pointing device still work - I have confirmed that bumping the pointing device or accidentally touching the trackpad while typing DOES NOT cause the cursor to jump to a new area of the screen wit the trackpad software uninstalled
6. Confirmed Windows is up-todate
7. Ran Virus scan (not safe mode)- nothing found

Here's the kicker: I have spent about 3 hours trying to troubleshoot this and I troubleshoot by typing emails to myself from her computer.  I would consider myself a pretty quick typist.  The trouble I have is that I would start troubleshooting and after making a few changes her cursor would stop moving and I could type 3 or 4 large bodied emails and not have any problems. Then she would hop on and start typing and then boom, the cursor starts moving.  She on the other hand types with her index fingers and is a much slower typist.  I have had this happen to me twice now.  It appears I have fixed the problem by being able to write large paragraphs without any random cursor movement and then a few hours later I get and email from her that the cursor is going crazy.  Please any help would be appreciated.  

This issue seems to be prevalent on many forums, most of the time it is related to people touching the trackpad while typing.  This is not the issue here, unless the trackpad it's self is malfunctioning.  

There was one suggestion that this might be a boot sector virus that can only be detected while in safe mode.  Thanks for the help.
OneSmallCreaseAsked:
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nobusbiljart fanCommented:
i suggest to install a fresh copy of w7 - or any other OS on a separate disk drive, to test if the problem persists
if so - it is a HARDWARE problem, if not software
you can also try if it happens when she is typing when booted from a live cd (i prefer Knoppix) - here a couple :
http://www.ubcd4win.com/                              ubcd  Win
ftp://ftp.gwdg.de/pub/linux/knoppix/KNOPPIX_V6.7.0CD-2011-08-01-EN.iso          Knoppix
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ChanduNelluriCommented:
Did you try logging in as another user (local Administrator) and see if it reoccurs?

-Chandu
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OneSmallCreaseAuthor Commented:
Chandu,

I will log her in as local Admin today and have her type her emails under that account to see if the problem shows up on that account.

Nobus,

Being that it's a laptop with only one drive I'm not sure how else to add a second hard drive to the laptop, other than connecting an external hard drive through USB....will that work?  Also, I will try type on another OS through a Live CD or USB Key.  

I will let you know what happens thanks.
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nobusbiljart fanCommented:
i did not talk about a second drive - i said another drive - to replace the OS drive
i don't see what a second one can do in such a case...
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OneSmallCreaseAuthor Commented:
Nobus,

Sorry I misunderstood you earlier.  I'm going to have her work off of a live cd like you suggested.

Chandu,

The problem still persists when logged in under a different user account.  

P.S. As I mentioned before, I have a very hard time getting the cursor to move while I'm typing, and she can make it happen in just a sentence or two.  I have watched her type like a hawk to see if she is hitting something and bumping something, and she is not.  It's amazing.  I will sit down and type, nothing happens, she sits down immediately after me and continues my sentence and cursor jumps.  She's had the computer for just over two months and she typed the same way all that time without incident, but somehow her index finger typing makes this problem more prevalent.
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Marc ZCommented:
Have you checked the accessibility options?  Is it possible she's hitting the keys that turn them on?
Have you tried giving her an external keyboard?  Same results?  Does she have a mouse attached and if so, can you change it?  
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OneSmallCreaseAuthor Commented:
mtz1of4,

I tried a usb keyboard and that worked without any issue.  Does it mean that the issue is hardware related and not software?
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Marc ZCommented:
It could be bad hardware, keys not releasing, stuck
Let her run a few days with usb and see if she has problems. External keyboard a lot cheap er then new laptop.
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Marc ZCommented:
Could be food stuck in the keyboard.
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OneSmallCreaseAuthor Commented:
mtz1of4,

The laptop is only 3 months old, so it's still under warranty if I need to have the keyboard replaced.  Also, I will check to see if there might be any food stuck under the keys.

You had also said to let her use the usb keyboard for a few days.  She's been using a usb keyboard since last Thursday without incident.  Someone else had suggested trying to load a boot-able OS like Ubuntu on a usb key to see if it might be software or hardware related.  Do you believe this step is still necessary?  Thank you.
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Marc ZCommented:
3 months old .  Warranty it.  
Although, is this a windows 7 machine that you downgraded to Xp?
A live cd wouldn't hurt to confirm hardware issue, before trying to get warranty.  A software issue seems much less an option other than driver issues.
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nobusbiljart fanCommented:
>>  Do you believe this step is still necessary?    << yes, do believe so, because now you don't use the motherboard jeyboard input, but USB - totally different
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OneSmallCreaseAuthor Commented:
Ultimately it was a hardware issues that was resolved by replacing the keyboard and trackpad and reinstalling the associated drivers.  Thanks to both experts for the advice that helped me to narrow the issue down from a software issue to a hardware issue.
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nobusbiljart fanCommented:
tx for feedback
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