Try booting the computer into Safe Mode by pressing f8 during boot up and reinstalling the software - note if you are installing the download version then boot into Safe Mode with Networking.
Hi, I'm strugging with the same problem. I've uninstalled the updates I needed to uninstall. I've restarted Windows Installer. And I'm still getting the same Overlapped I/O error message. I turned my antivirus off, and still getting the same error message. PLEASE HELP!