A few days later, the problem reappeared: the inability to launch SteamVr home and most steamVR programs. After several trials, trying to kill everythings running in background...I can certainly say , at least in my case, the conflic was generated by a software called Rivatuner statistcs server (as far as i know is called up by my MSI afterburner graphic card mangment software..) . Inside the settings of Rivatuner there is an option called "Application detection level"; just bring it to "none" and restarting steamVr, successfully restore steamVR Home and all other Steam Vr programs who did not start. Hope can help, bye.
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