I have to disable my Synaptics TouchPad V7.2 on PS/2 Port 1 (took that right from my mouse properties; it shows up in the task bar as "Lenovo Pointing Device") every time I log on to be able to use my 1-4, tab, and spacebar keys.
I believe a windows 10 update last month caused this to happen. It's annoying having to disable the touchpad every time I log on to do homework and even use the internet. I don't even use a touchpad on this laptop. It's a Toshiba L775.