When I downloaded the new drivers for DWA556 Windows goes into classic welcome and shutdown windows mode when i try to switch it comes up saying that this file WlanGINA ver 1.0.4.0 made the change and i need to uninstall the program. The utility can't find any networks (v1.21 finds 5) and my wireless does not work at all from this computer. Fast user switching is killed by this file as well. Reverting to v1.21 fixes everything. Driver package seems VERY unfinished to have been released. Even after a restart nothing works in the v1.30 driver.
Now has a wonderful constant restart bug with all driver versions, something introduced with the last 2 driver versions 1.21 and 1.30 has stuck in XP and won't come out even with your uninstall routine so downgrading is not successful. Kills some windows features without asking and microsoft says it should NOT be able to and to remove the driver/device causing problems until a fix is found by the manufacturer. May just do that, other working atheros cards available.