I bought a HP Envy 700 awhile ago, now I'd like to use it for some light gaming. I've upgraded the PSU to a SolidGear Neutron 750W and the GPU to a Radeon R9 290. Now, can I easily replace the CPU with a better/faster one? The motherboard is a MSI JasmineR (I believe). When I replace the CPU, will the OS (Currently Windows 8.1) complain and need to be re-licensed? I'm a real noob at replacing CPU's. The CPU is an AMD A10-6700.