This is the latest information from my side. To fix the freeze problem on login screen when using Nvidia web drivers I update the macOS 10.12.3 to 10.12.5 (using App Store updates) and after I reboot my system, system was saying graphics drivers are not compatible and I uninstall those and after reboot system pickups the Nvidia driver that comes with macOS (Official) and my system seems to working fine now but after 10-15 mins my system goes to hang state and mouse cursor icon changed to double arrow sign.
Any suggestion how to fix this problem? any pointers are greatly appreciated ? do I need to remove any macOS system file or kext file to fix this problem?