I recommend you to get the latest drivers from Elbox if you intend to use the power flyer under os3.9. I had a terrible headache trying to get os3.9 to work with the old PowerFlyer drivers (it didn´t work out very well, even if I used the skipromupdates after the setpatch command).
BTW, if it hangs during install make sure your cd drive is connected as a slave to the boot disk (device 1) or else WB will most likely not be able to find it. Also, don´t use the drivers when installing...
