I can confirm: 1473 is definitely a no-go on XP64.
Updated via the GUI, everything seemed ok, but after reboot the problems started:
- 32 bit apps do not work. They just sit in the task manager as phantom processes using ~700kb. Can't kill them, not even with the shields disabled. With the shields disabled, you can use 32 bit apps.
- uninstalling avast takes forever.
- system won't reboot. had to reboot with the reset switch
I tried a clean install after uninstalling in safe mode with the aswclear utility and re-installed, no luck, same problems.
I've always had problems with avast on XP64 (can't update nic drivers with avast enabled. Can't install virtualbox either (probably related to the nic issue). SUMo program won't work with the shields enabled.), but the system was usable. Now it's a complete no-go.
I also noticed that there were no items on the "additional protection" tab except URL blocking, no sandbox (it seems this never existed in the first place for xp64), no browser protection and no remote assistance.
I hope the devs can release a fixed version soon.