@XappA Not sure what's messed up... or how bad..
BUT
if you can boot into LL - running the command below will query installed OS's = it should add Windows to grub which you can use to boot to Windows..
sudo update-grub
Then when booting, in Grub, Arrow down and select Windows ...
For the Windows boot manager - it may be that you need to need to change the boot order, and add it as the 1st boot device ...
BUT if LL hasnt been added to the bootmanager you'll need to either change boot order back to where grub/ubuntu/?? or add LL to the Win boot manager --
You'll want to research BCD /BCDEDIT on how to manipulate.