Runs flawlessly under the 64 bit version of Windows 7. The 5 star but gets only the product of AVM! Supplied the original Fritz card. The CD was however fired !! Why not an original ??? To install: 1. Download Latest Update version of AVM 2.PC runs -> CD purity> driver installation (running automatically) -> CD rausnehmen-> PC shutdown Attach 3.Karte into free PCI slot 4.PC anschalten- purely> CD 5.Installation the update !! The original CD must be in the drive !! Done.