Thank You . As I found out , it was the firewall ( Zonealarm) , that killed the downloads. It worked fine for years and than turned bad without reason . Now I dated it up and it works fine again.
It had nothing to do wit the rundll problem.
By the way , I uesd Tweaking com Windows repair 1.9.1 to register the system DLLs. After that I could not go online wit Windows live mail anymore. It stayed offline . So I had to install the registry backup .
OS Win 7 64 bit Home premium