I am running the latest Windows 7 RC and at first I did not succeed using GeoHot's JB http://purplera1n.com/. But with all things tech wise... Never give up. To put in short and simple. 1) Download .exe 2) Plug in iPhone 3GS 3) I closed iTunes(Dont know how much this matters... I just know the one time I had iTunes open I got an error.) 4) Run the .exe and wait aprox 7 mins( Again... This was just me... I suggest waiting till atleast the pruplerain says done ~ waiting for reboot) 5) After the 7 mins close purplerain and reload it and run it again. 6) Geohot's logo comes up and about a minute-three minutes it reboots. Tada. 7) Click on the freeze app and install Cydia. Once finished reboot your device and enjoy.