ReactOS 0.4.5 Released
I tried installing this on the latest VirtualBox release.  It installed cleanly, but the VM would not fully boot. 
 It just hangs on the startup splash screen, with the progress bar about three-quarters of the way across.I found a wiki page advising VirtualBox users to disable "I/O APIC", and to change the virtual network adapter to "PCnet-FAST III".  But this made no difference.Just to be thorough, I re-installed completely from scratch with these settings.  Still no difference.Just to be crazy thorough, I created a new VM profile that was set for a 32-bit guest.  Reinstalled from scratch.  Still no difference.Gave up.Nothing but respect for the ReactOS folks, and all they've done over the years.  But I imagine that the overwhelming majority of people who try this out are doing so in a VirtualBox VM.  So if you don't have an up-to-date and accurate list of instructions for installing ReactOS on VirtualBox, prominently displayed near the download page, then you might consider prioritizing that.