Windows 7/Vista with Windows Aero running (IMPORTANT!!!)
.NET framework 3.5+ (I believe I used version 3.5)
[*]WINDOWS AERO MUST BE TURNED ON!!!
If you fail to have windows aero enabled, you will simply get a giant black box covering the emulator. Aero is needed for the transprency effect, otherwise the overlay will be opaque, thus the black box. To use it, simply start a vampire savior match, launch the over lay, check what you want and just press start. The overlay will not draw unless you have the emulator in focus (clicked on).
Here it is, small, lightweight and fast: