Hi Cary,
The following Microsoft Support article addresses this issue:
http://support.microsoft.com/kb/896866
Apparently, you need to download a file called Local Installation
Source Tool located at:
http://www.microsoft.com/downloads/details.aspx?FamilyId=10FA7AA3-695B-42C3-9045
-B812BA0FED3E&displaylang=en
Hope that helps.
Regards,
Steve
www.stkomp.com
> Out of the blue, when I now launch MS Excel 2003 (WindowsXP|SP2) I get
> the MS Office Install dialogue box (?) which then fails to then find a
[quoted text clipped - 10 lines]
>
> Help and Thanks!
Nick Hodge - 11 Dec 2006 17:15 GMT
Steve
This kb article is for first use. The Op says they have been using it for 19
months with no problem

Signature
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
nick_hodgeTAKETHISOUT@zen.co.ukANDTHIS
www.nickhodge.co.uk
> Hi Cary,
>
[quoted text clipped - 27 lines]
>>
>> Help and Thanks!
Cary - 11 Dec 2006 21:23 GMT
> Steve
>
> This kb article is for first use. The Op says they have been using it
> for 19 months with no problem
Could my recently installed Windows Live OneCare have something to do
with it?
Nick Hodge - 12 Dec 2006 07:20 GMT
Cary
Very much so, try doing a system restore to a point before you had the issue

Signature
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
nick_hodgeTAKETHISOUT@zen.co.ukANDTHIS
www.nickhodge.co.uk
>> Steve
>>
[quoted text clipped - 3 lines]
> Could my recently installed Windows Live OneCare have something to do with
> it?
Cary - 12 Dec 2006 15:11 GMT
> Cary
>
> Very much so, try doing a system restore to a point before you had the
> issue
The restore method seems to have done the trick (for the moment?)
Thanks!