When I purchased my laptop the HCL representative told me that it is DOS machine (I don't know what that means).

Deleting "system reserved" partition I think is the main cause.

I don't know...

I had problem dual booting win7 and win10. After many attempts I was able to dual boot.

But in the process, I deleted "system reserved" partition. So windows want start. I performed start up...

failure when attempting to copy boot files.

ran 3 pass with no error

Even if try to install win7 in place of win10, I get the same error. So I dont think there is problem with iso.

This screen shot was not of my laptop. (it shows similar error so that I attached)
...

For image look in my 2nd post.

I have attached error and disk images.

When win10 first came out months back I was actually able to install it in dual boot with win7.

sorry for that.

I have attached disk partition image. Also deleted D drive and left it unallocated.

winload.exe digital signature cannot be verified error code:0xc0000428
I want to dual boot windows 7 and windows 10.

I have windows 7 installed on my C drive. (disk manage image attached)

Win...