Problems with booting

Aug 14, 2018
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I have a Sony Vaio VPCYB15AG which had Windows 7 Starter 32-bit pre-installed. It's HDD crashed after a few years and got damaged. So I got it changed and also upgraded it's RAM. The person who repaired it somehow installed Windows 10 Pro 64-bit. Now a week ago it had a fatal error and would not boot properly. I tried to use CMD, Resetting or going to previous build but it won't work. Now I got a Windows 7 Home Premium bootable USB and tried to boot but that didn't work. I tried to change boot order in BIOS and also enable external boot device but still it won't boot. I have H2O BIOS system. Please help me, I tried every possible method , it won't help.
 
Aug 14, 2018
8
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I earlier told I tried every possible method from fresh install to upgrade to boot from USB. The PC does not seem to boot for USB. I need help to boot from USB. I also tried to change boot order in BIOS and also enables the external device boot but still it won't boot from USB