I am using a Toshiba Satellite C55-B and am using Windows 10 Home
A few days ago I noticed something different. I was playing one of my favourite games, but as a ran it, I noticed that every time I ran the game, it would crash the whole system. About the ram, it was running faster than 3GB but I am sorta leaning to a conclusion that one of the cpu's cores had died out... but at the same time, not really. The game ran fine on my old computer with 2GB of ram [I don't have it anymore now...]
Toshiba Satellite C55-B is very old version release in 2014, I don't think it will support Windows 10. I would recommend you to downgrade to Windows 8.
Your "Bay Trail" processor is supported on Windows 10.
You may want to do some maintenance/cleanup on your system, then do a windows "reset".
Make sure you have your data backed up.