Did you disconnect the USB cable before the app load process was done? You've terfed your OS. Download the javaloader.exe or JL_Camdr wipe the OS and re-install it. Search for either they've both been posted, if you can find a post by d_fisher he has both in his sig.
Also try: Make sure you have the current desktop manager and handheld OS on you PC and cunnected direct not USB hub. 1. do a
2. When you see the hour glass double click the AppLoader, loader should show your PIN, follow through the OS load. Hopefully you backed up?