I just installed 4.3.1 and tried to run it on my XP Pro Desktop machine, which has all appropriate patches through May 11th installed.
When I run analyze against either of my hard disk volumes (C: or D:), 4.3.1 immediately exits. 4.2.9 ran correctly to both analyze and defrag C:
I uninstalled and reinstalled 4.3.1 without any change in behavior.
4.3.1 runs successfully on my Vista Home Premium Laptop.
Thanks for you help with this issue.