How can I find the right upgrade for a Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz 3.40 GHz. Should I also replace the Motherboard? I have had Dell Desktop XPX 3800 since 2012. It has 12 g RAM and I have upgraded my hard drives. It uses Windows 10 Home. It seems to be having trouble rebooting. I wonder if it is in need of upgrade.