That’s a bummer. I get the exact same error. What’s even weirder, the disabling works for me sometimes (seemingly random). Like if I uncheck and restart 10 times, I get the error (and resetting of the checkbox) 9 times, before it eventually succeeds. Although with the next restart, it will then be gone again.
But that magical one time where it randomly succesfully disables hardware acceleration, all the RAM problems are gone. 
Edit: Maybe it is a general problem on Windows, that users cannot disable hardware acceleration?
Maybe any other Windows user can confirm if it works for him or her?
At least the memory problem seems to occur for other Windows users too: