Yes i have exactly same issue here... All my Laptops(i3,i5.i7) and Pc's VT dissable because of this silly things.. ihave to uncheck the "Enable hardware-assisted virtualization". ijust notice when my dell i7-2670qm, 6 GHZ RAM laptop slower, i use third party software (SIW) and other software and the result are same (VT dissabled), so i check all of my laptops and computer and uncheck the avast "Enable hardware-assisted virtualization" and its all working fine again (enable). what is this?? im one of the loyal avast user and recomend to all my colleagues and friends offices since years ago,now im start doubt about avast product and start to find astep better than avast. yeapp... im not a fanatic person if find trouble in silly things but affected something huge... hope avast can be better and more see the detail next time.