1. Use a memory mapper program to see how much memory, is being used. (It should not be that much, I usually have about 20 simialtaneous downloads going at once. Plus I will be running my other apps. (Photoshop, Premiere, After Affects, and Final Cut Pro 2 and Internet Explorer). I've not had one problem with it quiting yet. (oh, I'm using a dual533 with 1.25GB of Ram)
2. Also check out how much bandwith you are allowing for uploads to others (pref. --- uploads ---- basic

If that doesn't help email me at
carnagex2000@(no spam)yahoo.com