Reading between the lines it seems that your drive powers up and runs,
but some of the data on it is unreadable. That's good news, believe it
or not, because as long as the drive is operational, you can probably
get at least some data from it.
The first thing I would do is to call the company that made the drive
and ask for their advice. They are in the best position to help you.
Even if you have to pay for the call, this is your data we're talking about.
The company may suggest you try this: Put your drive into a second
computer, so it's not the boot drive, and use the copy of Windows on the
good drive to read the data on the bad drive. If you can do that, backup
as much as you can from the bad drive to the good drive.
There are repair tools you can use, like Steve Gibson's SpinRite, but I
would not try any repair procedure without talking to the manufacturer
first. You want to be absolutely sure you're doing the right thing.
Rub Salt In The Wound Department: See my sig(nature).