If you do have another drive that can boot Windows 7, you can use the Disk Management tool to build a new system partition on your existing SATA drive. You have to shrink the existing partition, and create a new partition. Then you can copy the boot files to the new partition using bcdboot.
An APU is an auxiliary power unit. On-board APUs are small jet turboshaft engines that are started to provide electrical and hydraulic power to the aircraft when needed during periods when the engines aren't running. Some aircraft are designed...
An APU is an AMD processor (CPU) with embedded graphics capabilities. GPU : Graphics Processing Unity. APU : Advanced Proccessing Unit is specific to AMD (Intel also has the same thing but it has a different name). APU is, essentianly and CPU and a GPU combined into the the CPU body. e.g. say you are using a calculator app on your pc, the CPU side of the APU is calculating all the numbers and logic, while, on the same piece of hardware the GPU side of the APU is rendering on the answers and text and imagrey on your screen.