My computer has been stuck on this screen for about two days now and I was wondering how I could fix this problem. I'm not computer savvy so I have no clue what is going on. My computer was running slow and it kept freezing for long periods of time so I decided that I would just turn the power off by holding the power button and turning it back on. That's when it started to happen. Also sometimes it say that isolinux has found something in drive=AF and that it failed to boot. I tried looking up how to fix this problem but to me it was like trying to understand a whole new language.