It is unlikely that this will get solved by you waiting for another user with a "magic" solution. if you are unwilling to download the trial versions of XP, then at least remove ALL of your plugins, remove ALL of your custom scenery, and unplug all of your hardware from your current install and then test. If the problem persists at that point post another log.txt file from that session. Diagnosing problems is a process, please follow the suggestions of those who are trying to help.