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...
Intel still calls it processors with an integrated graphics core a CPU. The APU is a AMD CPU with a entry level Radeon 6000 core (for the FM1) or an entry level Radeon 7000 core (for the FM2) GPU together. The APU can do much better graphics then any Intel CPU or regular AMD with integrated graphics.