Unity installer stucks on

Hi all, I have problems to install unity editor. It happens with all versions I have tested (5.1.4, 5.2 and 5.3). It just stops, last messages says: Image version 10.0.10240.16384; then, it is not possible to stop or exit the installation.

I have tried downloading the assistant and getting only the editor, and downloading the editor directly. Same behaviour, when installing the editor from the command line.

The development web player installs perfectly, if I download it and execute from the command line.

Seems like a process that is blocking the installation, or a conflict with any other software, but cannot find out what. Right now I am running w10.

Any idea? Thanks! Efraim