Hi Christoph
Versuchs mal:
1.) Open Control Panel
2.) Go to Add/Remove programs
3.) On the left hand side there is an icon called "Set Program Access and Defaults". Click on it to execute the option.
4.) In the window double-click on 'Custom'
5.) Choose your default Web browser and your default e-mail program.
6.) Click okay. A Window with a process bar should pop up.
7.) Give it a try. It should work now.
HTH
Uwe
Portland, Oregon