Solidworks started running unusably slow out of nowhere (i.e. rendering 1 frame per second for simple sketches).

I've re-installed Solidworks, updated video card drivers, virus scanned my computer and Solidworks is still unusable.

I'm running a Intel i7-4800MQ processor and have an Intel HD Graphics 4600 video card with 2160MB.

What else should I do? I'm going crazy here