[Rehan]

Please note: Deleting the operating system and / or the partitions of the operating system will NOT remove the entry in the UEFI BIOS. This entry can (e.g.) be removed by completely resetting the UEFI BIOS or it will be overwritten with the installation of another operating system in UEFI mode. Since you have now deleted the operating system or the partitions from it, the entry "PrimeOS" now points to nothing. Therefore, the boot menu always goes back to the beginning.

First of all i will thank you for replying me. and now i will ask you, how can i reset the UEFI BIOS? Do i try to reset system setup settings to default? or any different mechanism to reset UEFI BIOS?

P.S.: Some of your steps were careless and thoughtless. Removing partitions from other operating systems can cause problems. The 100 MB partition (Windows 7?) can cause problems when deleted. I already had experience with it. Windows has not started up after deleting this partition. Fortunately, the solution was quite simple. Started from a Windows DVD, opened the command line and reinstalled the Windows boot loader or overwritten the old installation (rather said).

Yea you are right, that caused some problems. I was aware of it. I made a backup before doing that. : Actually primary OS was in need of re-installations because of the failed installation from .exe were also showing options at startup. I know that was not the solution but i did that.