Kali Install & EFI Partition Question

Hey everyone,

So I've recently gained interest in I.T. and NullByte threads and thus attempted at installing Kali.

I'll try to keep the noobish question "short" :

I'm currently running windows 7, had installed ubuntu in dual boot before and then deleted it. I supposedly removed the grub with easyBCD and then deleted the partitions. All the partitions but a remaining 200Mo EFI one that windows doesn't let me manage.

I have only one disk and 3 partitions on it (screenshot at the end)

Now when installing Kali using the full ISO burnt on a DVD and "P2 MATSHITDVD" boot option ("UEFI MATSHITDVD" just greets me with a black screen), it says Kali "was succesfully installed" so I just remove the DVD and reboot but it just boots on Windows.

When going into the boot options I have :

• Windows
• ubuntu
• P2 (MATSHITDVD)
• UEFI (MATSHITDVD)

"ubuntu" option shouldn't be there anymore and it keeps getting back when manually deleting the boot option.

So I thought the 200Mo EFI Partition's content could be reponsible for this and preventing another linux distro to set a boot option somehow.

Of course the the disk manager doesn't let me delete it and neither does DISKPART ("Deleting a partiton is forbidden on the active boot, system, fime sharing volume" along those lines).

here's a screen of my disk management (in french) :

Obviously the nuclear option would be saving everything, burning windows7, DBANing the disk and starting it all over but I'm trying to use a more flexible option yet :)

TL:DR :

Might the EFI partition alone be causing Kali to fail its full install?

Is there a way to delete an EFI partition on the disk without wiping everything else?

Thanks.