Has your computer ever re-drawn the screen slowly? Or has a lagging program ever turned black or duplicated itself like this as you try to drag it around? You can alleviate these slow-downs and even prevent GDI driver-mode related crashes by using Windows Aero, available in Windows Home Premium and higher editions. You can tell if Aero is on by looking at the top of almost any window. If the window controls (known as caption buttons) are touching the edge,…