By facing and solving that problem i posting it here.
Problem : I run my ETN miner and put my etn address and click start mining but still it's not staring.
Solution :
Now Restart your computer.
Go to your task manager and end your running app which you don't need now. (like for me when i start my computer it's automatically run my Steam and using task manager i end the steam process)
Download a software (Download Microsoft .NET Framework 4.7.1 (Web Installer))
Install It
Run Your ETN Miner
Thanks
Hope it will solve your problem.