I need to install Windows 7 x64 Dual mode with Windows 8 in UEFI mode but not boot the usb device and I have secure boot disabled. my question is, windows boot manager (BCD) should have entries for usb boot?. If so, how would the command to add these entries?

I can only start Windows 8. my ultrabook is acer v5-132

The reason you are not able to boot your USB-stick is that you have the formated it with the wrong partition table.

You have to format it with MBR for UEFI or GPT partition table.

Rufus is a great tool to fix this.



If you are using a Flash Drive to try to install Windows 7 in UEFI mode, it will not boot that way unless you have completed the extra steps to make it capable.

Did you create the Boot partition on the drive and add the additional file?

Being formatted as Fat32, as Christoffer mentions is also necessary.

If Secure Boot is interfering with the Windows 7 boot, you will probably get to the 4 colors coming together and then get an error message or put back into the bios setup, depending on your system. If that happens, enable the CSM.