when I try to access a share e.g. like \\computer\c$ on a Windows 10 (!!) computer I get a windows message box which asks for credentials. After inserting the credentials TC crashes always

It probably has to do with the fact that per default it's not possible to access a c$-Share on a windows 10 machine.
After inserting on the target computer a DWORD32 value with "1" on this key here HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LocalAccountTokenFilterPolicy I'm, able to access the share. But that has nothing to do with the TC behavior.
Regards Wolle