depends on many things. but posting your system hardware helps narrow down possible solutions.

Read a temporary fix; put down the anti-virus shields when starting the game and then, put them back. Seems to me is a matter of license authentication.
Worked for me.

thats good to hear. yeah i dont run AV stuff myself anymore. i keep it handy but i dont make it screen everything at all times. i just developed good habits so it doesnt have to.