I've looked through a lot of posts about this, but none of them seem to match the problem I'm having.

My hard drive crashed last week. The exact same error had happened a year ago with my last hard drive, so I decided to build a new computer. I've built that and it's all fine, but I'd still like a lot of data from my old hard drive. I tried a lot of solutions before, like Partition Table Doctor, EASEUS Data Recovery and Data Rescue PC but none of them worked. I read about Knoppix and decided to give it a try. Firstly, I tried loading it with just my current hard drive. It loaded up fine, and Knoppix opened the drive. Then I turned it off, plugged in my old hard drive, along with my current hard drive and it loaded up fine again. I got to the desktop, yet when I double clicked either hard drive, both of them gave me the following error:

Could not mount device
The reported error was:
And that's it. There was no error below it, it just had that.

I used XP and NTFS on my old hard drive.

If anyone could help then I'd much appreciate it, thanks a lot.