Armory works great for me on Windows 7 64-bit. I did encounter a nuisance though: If Bitcoin-QT isn't installed in the C:\Program Files\, Armory had trouble locating it. I tried to give the correct location in settings, though that didn't seem to work. I also found it difficult to remove the blockchain from my C drive as Armory keeps it's own copy there (which is a problem when working from an SSD with limited space). The solution was to open command prompt and make symbolic links for both Armory and Bitcoin, though it would have been easier if this could be done from settings.