Steve,

Maybe...

System Restore
Start | All Programs | Administrative Tools | System Tools | System Restore

or

http://support.microsoft.com/?kbid=290301
"Windows Installer CleanUp Utility"

Jim Cone
San Francisco, USA
http://www.realezsites.com/bus/primitivesoftware

My CD ROM does not work on my computer and I'm probably not going to get it
fixed (will be getting a new computer later).  Office Service Pack 3
automatically started and it asked for the Microsoft CD, which won't work on
the computer.  I had to cancel it.

Now when I try to run Excel it wants to do an install and it asks for the
CD.  I can't get past this to open Excel.

Is there a way to undo what this Service Pack started and go back to the way
it was.  I would rather have Excel without the Service Pack than not have
Excel at all.