I agree with a serial number, but nothing more than that. I prefer to install all my softwares OFF-LINE in order to have at least one image backup file that is 100% clean. Even winXPproSP2 forces me to use an internet connection for its activation and an activation by phonecall is too expensive for me. I tried the OFF-LINE activation method, but it didn't work. And what everybody does, doesn't mean it is right. FirstDefense-ISR is a software without all that crap, you don't even need a serial-number to install FD-ISR.