I can't delete a partition i created for dual boot/Windows 7. constant blue screen of death.

[Tadas WIN10]

Hello, i wanted to dual boot my Windows 10 Pro laptop with Windows 7. Earlier i wanted a better performance on my laptop because it was slow, so i searched up on youtube on how to dual boot, because i didn't want to affect/erase my mom's account. When i created a partition for windows 7(50GB) i got a blue screen of death and when i booted the laptop again and my laptop's system was running on the partition i created(yet it wasn't Windows 7, it was still Windows 10), now i cannot delete the partition, i tried to set the main partition of my computer "Mark this as active", but it gave me blue sc

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