I know that has a lot of topic like this, I've tried them a lot as well but my problem is not solved. My laptop has Core i3 and I used to use VBox just a few days before. When RAM got up to 99% my laptop crashed. I had to restart and now I cannot run VB again although VT-x is enabled and Hyper-V is disabled.
Acceleration tab is disabled:
Can anybody help me? Thanks a lot!