Terraria

Hey guys do you know how to fix this error in terraria Microsoft.Xna.Framework.Content.ContentLoadException: Error loading "PixelShader". ---> System.IO.FileNotFoundException: Failed to load XnaNative.dll. Please verify that you have the XNA Framework installed. at...

I downloaded Terraria from steam and it has a big SwiftShader logo in the corner. I don't have SwiftShader, I've looked at the solutions about using a hex editor on d3d9.dll but I don't have one in the directory. I even tried doing it on every d3d8/9/10/11.dll on my computer but to no avail...

I downloaded a cheat table for Terraria from a friend but he has a shady past and is known to sometimes, although rarely, give viruses to friends. Is it possible for him to store a virus in a cheat table which wouldn't be picked up by avast? The cheat table works fine but I'm not sure if he got...