Can't run minecraft any more. Only recent programs installed are logitech gaming app, and then an HD texture pack.

Put the summary of the bug you're having here

What I expected to happen was...:
I should play the game

What actually happened was...:
Launched MC, low error merrory, 16gb RAM installed, 4gb allocated

Steps to Reproduce:
1. Launch the game
2. ...
3. ...