2 iexplore.exe processes in task manager when ie8 launches & remain after closing ie8

I am experiencing a problem with multiple computers at my business.  All are running Windows XP Pro SP3, IE8.

I first check task manager to verify no instances of iexplore.exe are running.

I launch IE8.  Task Manager shows two entries for iexplore.exe.

I close IE8.  The 2 instances of iexplore.exe remain in Task Manager.

Users have been complaining that their computers have been "freezing" when this happens.  When I "end process" on both instances of iexplore.exe, the computer behaves normally again.

I just started receiving complaints about this problem this morning, 11/24/2010.

Please advise.
brianp111Asked:
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Dr. KlahnConnect With a Mentor Principal Software EngineerCommented:
It may be useful to check the Browser Helper Objects to ensure that nothing unwanted is being brought in with IE.
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TBK-ConsultingConnect With a Mentor Commented:
agree with DrKlahn - most likely an add-on of some sort is causing pieces of the browser to stay open, you may need to remove these.
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Sudeep SharmaConnect With a Mentor Technical DesignerCommented:
Try running IE without addons. Here is the guide how to do it:

http://www.addictivetips.com/windows-tips/how-to-start-firefox-and-internet-explorer-without-add-ons/

Sudeep
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brianp111Author Commented:
Bingo - all 3 of you were correct.  I disabled the Norton toolbar (which also disables the Symantec NCO BHO and Symantec Intrusion Prevention add-ons) and the problem goes away.  I'll be reporting this to Symantec.
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