After picking an output file location and clicking next, the process starts, advances on the scroll bar about 1/3 of the way and stops. Leaving the program run overnight advanced it no further. Why is this?

Which version of AutoStreamer did you use and did you extract all of the contents to a folder and then run it from there? Also what are you trying to slipstream as there is a known problem/bug (confirmed-at least from the last I heard) that you can't slipstream, say, Win XP SP2 into XP on a 2000 machine and vice versa. If you can give more details on what you did, we may be able to help further. Thanks.