os installation on acer e1 522

[amuini]

i bought acer e1 522 (4 gb ram,2 Ghz,amd A6) it comes with linpus linux os(practically useless) i cant install os (windows )via usb ,my usb is not displayed in boot manager
is there anything deal with this --
boot type UFEI other type is legacy but i didt tried it

 

[amuini]

finally i got
i changed boot type to legacy now my bootable usb is detected
but still i got partion problem while windows 8 os installation
so i press Shift+10 cmd prompt appeared there listed and selected my volume and i cleaned it
now i can install the os in it