Office 2003 apps trying to load following upgrade to 2007

Hi experts!  I recently upgraded Windows XP Pro clients running MS Office 2003 to Office 2007.  On occasion now, I've noticed that when I try to open Word or Outlook, the system tries to open the previous Office version and I get an installer error.  Once I cancel out of that box a couple of times, Office 2007 loads just fine but I'm not sure why I am getting this as our a few other users.  

In the event viewer, I noticed these errors (see code section below):

How do I fix this?  I appreciate your help.

Event Type:	Warning
Event Source:	MsiInstaller
Event Category:	None
Event ID:	1001
Date:		9/15/2011
Time:		9:31:30 AM
User:		xx
Computer:	xx
Description:
Detection of product '{90110409-6000-11D3-8CFE-0150048383C9}', feature 'EXCELFiles' failed during request for component '{A2B280D4-20FB-4720-99F7-40C09FBCE10A}'

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.


Event Type:	Information
Event Source:	MsiInstaller
Event Category:	None
Event ID:	11729
Date:		9/15/2011
Time:		9:34:39 AM
User:		xx
Computer:	xx
Description:
Product: Microsoft Office Professional Edition 2003 -- Configuration failed.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7b 39 30 31 31 30 34 30   {9011040
0008: 39 2d 36 30 30 30 2d 31   9-6000-1
0010: 31 44 33 2d 38 43 46 45   1D3-8CFE
0018: 2d 30 31 35 30 30 34 38   -0150048
0020: 33 38 33 43 39 7d         383C9}

Event Type:	Warning
Event Source:	MsiInstaller
Event Category:	None
Event ID:	1001
Date:		9/15/2011
Time:		6:34:54 AM
User:		xx
Computer:	xx
Description:
Detection of product '{90110409-6000-11D3-8CFE-0150048383C9}', feature 'WORDFiles' failed during request for component '{1EBDE4BC-9A51-4630-B541-2561FA45CCC5}'

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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