if the package says Win 7 compatible, it should work. If you have Movies 7, then it might work installed , e.g. under Win XP compatibility mode. You would need the burn routines from Magix though.
If Video Easy should be ok. Try starting your computer in Windows Safe Mode, (details in Windows help) and installing using the option as administrator. Make sure that no other USB device is connected, not even a hub, mouse and keyboard ok, and also make sure that you are plugging the device directly into a USB port on your computer.
If that doesn't do it, get in touch directly with Magix Support, or provide a little more background info for people here.