I only tried with JRE 1.5.0_9.
Is it recomended to use JRE 1.5.0_10.
I'm no expert, but I'd probably try that or JRE 1.4.2 (or are they not
making those for Vista?). I'd also scour Bugzilla for relevant bugs,
there seems to be quite a few reports of crashes. Maybe also try the
newest I (Integration) or M (Milestone) build if you aren't already?