After several failed attempts to upgrade Windows 8.1 to Windows 10, I tried a clean install using a CD and a valid key. I tried booting from the CD and go through the upgrade and also starting the process from within win 8.1. In all the cases, the first but stops at the Windows flag! The system was checked for compatibility and it is fine.
I do not care about preserving the contents of my drive so I wonder how can I initiate a format from the Windows 10 CD. Any recommendations?