Win10 won't boot on newer computers

[Trozza]

Thanks, I've tried re-organising the partitions. However, I don't know what happened but I can't seem to be able to select a boot partition. I wasn't sure what was meant by "The destination boot partition must be 20% larger than the used space on source boot partition." but I figure it could relate to my problem. I tried creating different sized boot partitions but didn't have any luck in being able to select a partition. I also attempted a single fat32 formatted partition, but didn't get anywhere either.

Screenshot below of the WintoUSB screen.