So I have the same problem with my MSI GT72R 6RD DOMINATOR, at it slowly and slowly got worse until they were unusable. It seems to be an MSI problem, and now I'm regretting getting this laptop, but this started to occur about 1 year and 2 months after I bought it until the keys stopped working entirely about 3 months later. (NOTE:L ALT also does not work for me) I just wanted to know if you found a solution or if an external keyboard work. I thought I was the only one with this problem, noticing how there needed to be 2 keys to be pressed to use the letter E or V or R ALT. Please reply back if you can, even though I'm late.