800xA Installation, System Version 6.03.2 with update of RU5
You need to reinstall Microsoft Windows. Sorry.
Always take drive images of all computers before installing System 800xA.
Some software part of System 800xA only permit successful installation one time per computer and installation of operating system. I believe some third party software has similar limitations.
Removing/uninstalling a software from Control Panel>Program & Features is not enough as some components and/or files will very likely be left.
This is why a second deploy is rejected.
Instead of implementing and verifying powerful "uninstallers" ABB recommend to image machines as a method to return them to their virgin states in case a reload or repair becomes necessary.