cpu doesn't support long mode [Win 8.1 , 64Bit , VB 4.3]

[X5Gamer]

Hello guys ,
i have a problem ..
see the picture :
ht tp : // i.imgur. com / VcawLPq .png

[Ramshankar]

Code: Select all

VBoxManage modifyvm <vmname> --longmode on

Or change the guest OS type under Settings->Basic tab to a 64-bit one.

[X5Gamer]

where i found "longmode on " ?
ht tp://prntscr. com /1xw301
and
see this : ht tp://prntscr. com /1xvvjf

[X5Gamer]

who can fix ?