ok, i just hooked one of these up myself just an hour ago or so....
first things first, make sure you are matching up your FCC ID number and version of "setup.exe".
Secondly, for those of you who have the ver 4. There are actually two downloads available, "f5d7050-ver4.exe" and "f5d7050v4010setup.exe". The first one is an outdated version (found by first google result). Its tecnically only written for XP and 98, not even vista, so. Use the second one. I believe i still used Vista comp mode install. but was installing and uninstalling so much, long story, but i still have vista comp mode checked. as others have stated, dont plug in till it asks, reboot, yadda yadda, good luck.