If none of the things I said worked, then it's probably your compile process messing up, breaking half way etc. If rad worked correctly, it would not make these problems appear, I've had this before when I don't compile rad properly (like I said before) so maybe you need to fiddle around with rad, try either increasing, or decreasing rad settings. Putting the settings higher may make the lighting look good, or putting them lower might stop your rad from crashing and making this error.
Or maybe, the problem is only in your computer, since you're playing cs:go at very low settings, I don't know, could be.