Microsoft Office Professional Plus 2010 encountered an error during setup.
I was getting this error each time I tried to install the software that I paid for and downloaded directly from Microsoft. I recently did a clean install of Windows XP Home Edition on this computer so in my case it wasn't related to a previous version of Microsoft
Office.
My problem might have been different, I'm not sure. BUT what worked for me was downloading Windows Installer again and running it. Apparently there was a corruption in my original Installer. I had already tried the suggestions I saw listed here and nothing
worked for me. I also couldn't install anything else. I would suggest that you try installing another program to see if you get any error messages about Windows Installer not being able to run in safe mode or something similar. If you do, go to this website
and download Windows Installer v4.5 for your OS. It should fix the issue.
Go here for the download:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=8483