After an OS repair, I reloaded AutoCAD LT 2006. When attempting to install "AutoCAD 2006 and AutoCAD LT 2006 Service Pack 1", as directed in the accompanying README file, I get an error message: "The service pack could not be installed because the expected Autodesk product could not be located on your computer. Make sure that you are using the correct service pack for the product."
I have downloaded and am attempting to run "AutoCAD2006SP1.exe" with my original product CD in the CD drive.
What else must I do?