The PreSonus Quantum interfaces are definitely not supported on Windows 7. But if you are not faint of heart, it is possible to hack the driver onto a Windows 7 system (or perhaps Windows 8). Here’s how I did it. OK, so first things first, this is TOTALLY unofficial, definitely not officially supported, and I am not responsible if these instructions brick your Quantum, render your PC unbootable, or cause any other kind of damage.