The Problem is, that i can only get Access to it, when i use it as a 2nd Disk "under" a bootable Windows Disk.
And when i do that, it lasts Hours, until i'm on the Desktop.
I guess it's due to the Size of the damaged Disk, which is 2 TB.
BTW During the loading Process, i get the Messages (roughly) "Windows is repairing Drive X 100% completed successfully", for all damaged Partitions.
But that is a total Lie.
Nothing gets repaired.
When i'm finally on the Windows Desktop then, i get no Access to the damaged Partitions.
So i fear that also your suggested Program will not get it.
Only when i shut down Windows and hold the Shift Button, to get into the "repair Mode", i get Access with Dos Commands.
But that again lasts Hours to get there.
So, as said, i will do it when i have more Time and the Patience for it.
And if i have that, i will probably try it with the chkdsk Command, maybe it works.
Now it's more important to get a working Machine as quick as possible (confirmed by my Girlfriend.

).