Make all windows Application open with.
Or you have Message This file does not have a program associated with it for performing this ...
Fake Antivirus
Fix it :
1. Find kot.exe in search windows explorer. Delete or rename to "kot.exe.etc"
2. Download this file Fix exe
3. Run File Fix_exe.com double click or right click run as administrator
4. Restart windows.
Congratulation you have fix your Windows..