Upgraded computer to windows 10, external hard drive won't open now

Hi, not sure if I'm in the right thread.

I upgraded my windows 7 computer to windows 10. I have an external hard drive that I am unable to open. When I connect it to the computer now, a reformatting window pops up asking to do this. Obviously, I don't want to delete the data on there as I used this drive as my backup. How can I go about opening this drive?

I checked on someone's else computer running windows 7 and my data is there, but my friend upgraded his computer to windows 10 and now I can't transfer data that way.

The hard drive is a WD Scorpio, model WD25000BEVS. Don't know if that is helpful. I am wondering if part of the issue is that I have this harddrive is from a previous laptop that ran windows vista. That computer failed bcs it was a subpar HP product. I literally baked the motherboard several times for it to work. I finally gave up and got a new computer but kept the drive. I should have reformated it but I only deleted everything but the user folder. Any help would be great.

I am wondering if part of the issue is ownership of the drive. I know that when I first used this drive I had it take ownership of the hard drive. I know this can be done in window 10, but I can't seem to ever open properties of the harddrive while its plugged in.

Stabbing in the dark here . . . I see you have a Surface 3, so I'm really going off on a limb. :)

BTW, welcome to TenForums.

1. Have you rebooted the computer since you upgraded from 7 to 10?

2. Have you unplugged the drive, rebooted the computer, then plugged the drive back in?

3. I'm assuming you did an upgrade, not a clean install.

4. How is the drive connected to the computer? Is it in an enclosure or something like the Black Ice?

Worst case scenario . . . is it feasible for you to do a clean install?

I'm asking all these questions so that in the likely event I can't help, the next person who tries to help will have the information.