I am also having this issue with my s2. I have had this problem before when I tried to install the opengl plugin. I would click download from internet, it would download and ask to restart fpse to finish install. I restart and it freezes at the select iso screen. Tried reinstall couple of times, but always same thing happened. I've heard the s2 has problems with opengl so I thought maybe it was just incompatibility and gave up. Just for reference, non-opengl worked perfectly.
Now, with the latest update, it freezes at the first screen. It froze at select iso screen, I tried reinstall and it froze at accept terms and conditions/select bios screen. I not sure what's causing it, but considering the update description included supposed opengl fixes, perhaps this is the problem. Hopefully will get this fixed asap.