5* computer performance to 1/2*

I don't know what has happened. My computer performance has suddenly gone down from 5* to 1/2* after I did an update on Windows 8. I am really pissed off by this, and I would like somebody to explain this to me.

Does the game still work as 5*? Maybe it's just the update causing the game to misread computer's specifications.

Game works at 1/2*.