I am going to just put this out there but it might be the OS if both PC's are running XP sp3 since I ran into the same issue with my T-Mobile 9700. It would do the same racing of the load progress bar and error. I could not get the OS to reinstall on my XP machine. I did how ever have luch with my Windows 7 64bit machine. Personally I would suggest trying a computer with a different OS. I have a feeling something in XP how it has been updated over time does not like the newwer RIM software loaders.