can not boot

[precherman]

i installed win 10.it could not finish the instalation so i tried to put it back to win 7.i tdidnt work so i tried to boot from a usb both os's .the bios regognises the usb but it is unable to boot from it.

 

[Lutfij]

You should enter BIOS and set your primary boot device to be your USB installer. If your installer seems to be corrupt, follow this tutorial to create a bootable usb drive within which you will see a link to download an .ISO for Windows 10.

Have you downloaded all the necessary drivers for Windows 10 inclusive of your graphics card drivers? Make sure you have connected to your system the drive you intend to install Windows 10 on to keep issues to a minimum.