If not, please uninstall the old before installing the new..
Hopefully, you mean you get the error when you attempt to INSTALL (not "upload") from the full, legal Office CD?
And if you happen to have Webroot Spysweeper on the computer, try uninstalling it temporarily, then install Office.
As to specific instructions for your error, see the link below and follow the suggestions there:
You receive an error message when you install an Office program or open an Office program or document
Hope this helps.
I am a student at MidState Technical College in Marshfield WI. I recently purchased the student version of the microsoft office package. I have Vista for my operating system and my trial version of microsoft office that I got for free when I purchased my computer has expired. I deleted the trial version but I get Error 1406 when I tried to upload the new microsoft office from the disc. What am I doing wrong.
Sincerely Ross Matthies