Hi HunnyKim. I was crashing at log in also. I did all the uninstalling and clean install reset my modem as SL suggested guess what nothing worked. My friend was haveing the exact same problem still no real answers from SL just the usual. We figured out that if the streaming music was on it crashed the program. We went and unchecked it out of preferences before we logged on and have not crashed since. Good luck hope this helps. Certainly SL live chat was no help.
If Lindens are going to continue with Realms they need to level the playing field. To many people are using speed huds and dash/fly huds. It give them an unfair edge.