The only workaround was to deinstall wireshark including wincap and installing it again. But after the nex reboot, it freezed again.
After searching around i found the following fix, with cured this problem:
inside the registry you have to change the DWORD start in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\npf
from 0 or 1 to 2. After that wireshark will start properly even after reboots....
Another possible solution are to issue these commands as administrator:
sc start npf
sc config npf start= delayed-auto
