NET 3.5 Update on Windows Server2003 x64, the not so easy way

Did you try to install the .Net 3.5 Framework on your Virtual Server ?
Maybe the installation fails with the following Error:

XPSEPSC x64 Installer: [2] Error code 1603 for this component means "Fatal error during installation."
XPSEPSC x64 Installer: [2] Setup Failed on component XPSEPSC x64 Installer

Okay, what can we do?

1. Rename the Edb.log file ( Click Start,Run and type cmd in the box)
    --> ren %systemroot%\system32\catroot2\Edb.log *.tst
2. Download the complete redistributable Package of .Net 3.5
3. The Printer Spooler Service must be active! Why, see here
4. Start the Setup again ( The Full Package)

Good luck!