All-In-One PCs are essentially laptops with larger screens, you cannot upgrade the CPU, as thermals are very limited and it is most likely soldered to the motherboard, or GPU, as there are no PCI Express slots.
There are no PCI Express slots suitable for graphics cards. You cannot use an APU in that socket. You cannot upgrade that computer, that's all there is to it.
to be str8 up 150$ isnt going far add a zero to it or..... you can get a decent gameing pc on ebay new for 600$ or you can build a real good rig for like i said add a zero 1100-1200. or buy used out of local newspaper not recomended at all..!!