Microsoft Visual Studio 2010 Service Pack 1 Installation

I had the same problem with my Visual Studio 2010 Premium, also on a German Windows 7 64 bit. After several hours I managed to install the Service Pack 1.

The problem is that the setup requires Visual Studio Tools for Office to be installed on x64 machines. So customize your Visual Studio 2010 Installation via the control panel (add/remove programs) and add the feature "Microsoft Office Developer Tools (x64)". After adding this feature, you will be able to start the SP1 Setup.