what do we need?
we need
1 sd card
1 usbstick (min 4gig)
HP USB Disk Storage Format Tool download
SDFormatter download
win32 diskimager download
[Diskimage] OpenELEC Stable - Generic x86_64 or [Diskimage] OpenELEC Stable - Generic i386 << this one works on old pc Download
right click on this icon and open with admin
you can best uncheck quick format it take longer, but your sure it will works
click on yes
format sd card
unzip SDFormatterv4.zip and run setup.exe
open SDFormatter
choose your drive and click on format
install win32 diskimager
open win32 diskimager
unpack OpenELEC-Generic.x86_64-4.0.7-efi.img.gz
choose OpenELEC-Generic.x86_64-4.0.7-efi.img
click then on write
end part 1