I have found many questions regarding this on this Q&A Board. However, I am not only moving my games from Vista to 7, but also from 32-bit to 64-bit. I once had some trouble doing so using a backup (same account), hence the reason I ask. Are there known problems moving from x86 to x64 while using the same Steam files?
I wouldn't mind downloading my games again that much because I have a DL-Flatrate, it's just that I would have to download around 200GB, which would take around 3 days just using my bandwidth for Steam. Also, my provider probably won't be happy.