It's already a third time I uninstall and install again SQL Server 2017 Dev version on my local computer... It's working fine for few days and than suddenly stop running with Error Code 3417: Cannot recover the master database. SQL Server is unable to run. Restore master from a full backup, repair it, or rebuild it. For more information about how to rebuild the master database, see SQL Server Books Online. I tried many ways to fix this, including security changes on master.mdf and of course full re-install. Until suddenly I saw in MS SQL log file this error before the main error: Error: 2775, Severity: 17, State: 12. The code page 65001 is not supported by the server I went to find this error in Google and I found this article, where the author talked with himself about logs, errors, screenshots and questions about them. Until in the bottom of the article he wrote: Uncheck  Beta: Use Unicode UTF-8 for worldwide language support  in  Control Panel -> Region ->