Holdrio,
hast du noch irgendwelche prog. Im Hintergrund am laufen? Virenscanner etc. ? Hast das SP2 installiert? Ich habe folgendes in der FAQ bei VIA Arena zu dem Thema gefunden:
Installation of the 4in1 drivers freezes right at the end.
If you have beta versions of drivers, such as beta Nvidia drivers on your system, then you must remember that they are not Microsoft certified and may conflict with other drivers, such as the 4in1 drivers.
Resolutions:
1) Try installing in safe mode
2) Remove the beta drivers by changing your video card drivers to standard VGA drivers, instal the 4in1 drivers and then reinstall the Nvidia drivers.