I was trying to update my new Curve 8330 on Sprint to the new 4.5 OS and every time the updater hangs on the "Loading RAM" dialogue and won't budge past that. I've left it sitting for over an hour with the same thing.
Any ideas? Does the fact I'm running Windows 7 matter? I've even tried running the update and desktop manager software in compatibility mode.
Yes, running Windows 7 could very well be the reason that you are having the problems. I have seen many other people have problems using Windows 7. After all it is a Beta and the BB device ware is not configured for it. While some have had success using Windows 7; from what I've seen most have not.
I would definitely try it on a pc running XP or Vista.