Stuck on boot screen

[Frank314]

System:

Medion Erazer x7851

MD60706

MSN 30023074

BIOS Version: 1.05.03RGME1_00001

After a windows update last night (don't know if it's related or just bad timing) my machine refuses to boot. I get the Medion logo and the spinning circle of dots and then it quickly restarts and repeats in a loop. 

I have tried accessing the BIOS but I have only one boot option from the SSD. No other option changes appear to have any affect. 

I purchased the laptop second hand last year and it has worked ok up until now however the battery is completely dead, if I unplug mains at all it immediately dies. Apart from that it is ok. 

I would very grateful if anyone can suggest anything. My first thought would I would need a Windows USB boot. Does that mean I need another Windows activation key? 

[Datwozza]

Turn it off using the power button hold it down, if this dont work do a fresh windows install.

Create a Windows 10 iso using a usb.

To install Windows, turn on usb boot option in the bios.

When you get to what drive you want to install it too, shift+f10, type in diskpart and clean the disk.

You wont need another activation key your motherboard will remeber your key.