L nova yoga kypad not working - letter qw?rty not working

I have an out of warranty Lenovo laptop and the keyboard qw?rty ? is not working. I have flipped off th cap, cl?an?d it and replaced button - cushion is good but still not working. Windows 10 Machine rcntly out of warranty....was going to buy old keyboard for replacement but thought i'd wait for advice ! Am told I need to replace drivers but will wait to hear Using spell check gets tedious ! Thanks Maggie