Hi siva
Have you successfully launch VS 2019 before or not?
We could try the following methods to troubleshoot the issue:
1.Run VS with safe mode: open CMD and go to C:\Program Files (x86)\Microsoft Visual Studio\2019\version name\Common7\IDE folder, run the command: devenv /safemode
2.Run VS as administrator
3.Temporarily disable any antivirus software and launch VS
Best Regards
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