Help to install windows 7 on TOSHIBA Satellite U845W-S430


Aug 1, 2016

I have a Toshiba Satellite U845W-S430 , it was windows 10 64bit , I need to install windows 7 64 bit but , I can not boot the windows from the USB , I have do a partitions delete on the recovery wizard after the windows 10 does not wok , I think it,s because of the UEFI mode or something like that , so I have changed to gsm mode the windows booting but there is no partitions showing , now even the windows 10 doesn't work it gave me this message "check media " please help me to fix this problem and make it work as soon as possible

Thank you so much!!