Roon Client Wont Start on Win 10 - Has Been Working

To me this seems to be a Windows issue, not ROCK. (NOTE: BACK UP What IS Important To You)

With Administrative Rights from the Command prompt, Run Chkdsk /r /f. (This part can take a while)

With Administrative Rights from the Command prompt, Run DISM /Online /Cleanup-Image /CheckHealth. (This part is quick)

With Administrative Rights from the Command prompt, Run DISM /Online /Cleanup-Image /ScanHealth. (This part can take a while)

With Administrative Rights from the Command prompt, Run DISM /Online /Cleanup-Image /RestoreHealth. (This part can take a while)

REBOOT

With Administrative Rights from the Command prompt, Run SFC /Scannow. (This part can take a while)

REBOOT

Re-Install Roon.
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DISM (Deployment Image Servicing and Management ) is a built-in tool which can dig out the messed up files, and traces out faulty changes in files.

The (System File Checker) sfc /scannow command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%\System32\dllcache. The %WinDir% placeholder represents the Windows operating system folder.

Hope this helps.
–MD