Re: Need help recovering data after installation
Folks have reported that the "replace" installer option, which they THINK will only overwrite the Win7 OS partition, in fact, overwrites other NTFS partitions as well. That could be why so many folks think they're only replacing the Win7 OS to discover that they lost their Win7 data as well.
In my experience, Windows tools are best at recovering Windows filesystems; Linux tools in recovering Linux filesystems.
You want to take a look at the partitions on your drive to see if there is a Linux filesystem partition where the previous Windows "D" partition used to be. IF that's the case, you may be able to use Windows partitioning tools to restore the Windows partition.
Ubuntu 15.04 Mate, Mint 17.1; MS Win 8.1, Win10 TP.
Will not respond to PM requests for support -- use the forums.