Atikmdag.sys error solution in English?

1. atikmdag.sys - Microsoft t.s. told me this error was from a "virus attack". They offered to fix it for a price. I have not received the D.I.Y.links promised by them yet. 2. I searched this community and found the thread below. Does any one have a similar solution in English?  If not, I'll do it the hard way I guess. No, I don't use Chrome, just IE & Firefox. Thanks  https://community.norton.com/fr/forums/r%C3%A9installation-pendant-la-p%C3%A9riode-dessai