Won't work on XP. This ver is for Vista and Win 7 only.
Jim
Thanks to Airbot we all know that now!

Review the link he posted for a few other things to note.
I suspect as well as what is seen with the IE 9 beta hardware not software rendering as referred to on the page there is all tied together. The old version is simply too old and being left behind!
NO MORE BETA! FINALLY!
I installed the beta and wished I hadn't until a actual release came. The beta went wrong for me.
I am hoping this will fix problems I had with beta, as Windows Live messenger was messed up for me.
No more beta?! The release seen here is the "final beta" since the finished version won't be available until Q1 2011. This is the updated beta before that is seen and went on better then seen with the first when installed on Vista a few months back showing it's coming better so far for general use.
Face Book is another question there. I can imagine there still will be a few more bugs to work out as far as FB and the other options.