Actually, I remember getting a similar problem from my old video card. When it was dieing, a lot of the text would just be really random. I also had that same problem when I overclocked one of my video cards. I'd recommend trying a different video card, and if that doesn't fix the problem, try some different RAM. Once everything other than the motherboard is ruled out, reset the BIOS. If that doesn't fix it, you need a new motherboard and/or CPU.