I played Minecraft for a few hours last night.  I had it running in tip-top shape, everything was nice and smooth. I come home from work tonight, reboot my laptop, and try to play Minecraft.  Apparently, overnight, the Optifine plugin has nuked itself.  The game will load up normally, but if I open it with Optifine enabled, it immediately seizes up within 5 seconds of loading ANY world.  

I'm at a loss.  I've tried everything.  There's no damn explanation.  I just don't understand, nothing has changed overnight.

I want a new damn computer 🙁