Thanks For the advices .
First - The version of ROON is the latest 64 bit ’ downloaded yesterday .
Second - I tried to install just the ROON Server , and control it throgh the app of my android phone and it works well , including indexing the files on my PC .
I’ll try to install the 32 buit version . If it dosen’t work - I can still play music because the PC is only for storage , and the music is transffered to a Chromecast Audio unit that connected to My audio set up .