I’ve done the fixed checked, what should I do now?

The computer is running a lot better, I haven’t had a trojan alert in the past few days. The only problem I am having is the screen going green on me and the lines cutting across and filling the page. I hadn’t had the problem til these recent trojans so I didn’t know if there’s a correlation. Everything else seems to be running fine. I did notice that my screen saver does not go on anymore like it used and I haven’t made any changes.