My dear friend, you are in a difficult position ! No panic !

If I were you I would do this.
Give the shaft a shot of W40. !  ouf  ;D
second, get out of FSX.
Next go to your start up programs and remove them all
( in an effort to give your computer more breathing room  :) )
sign off and restart.
what if.....
I love the 767, it is a great plane, I fly her often, she also has great legs ! :)   8-)

Raymond   Boeing or nothing
KFLL  South Florida