Information from Firestorm
The issue of getting “stuck initializing VFS” is the result of a lack of support offered by Intel and Windows 10. It should only be affecting the 64bit version of Firestorm. The 32bit version of Firestorm should not be affected from what other users have reported.
As of our current release, Version 5.0.7., the Firestorm developers have come up with another workaround to compensate for this lack of support. So if you are wanting to use the 64bit version of Firestorm, could you please install the current release once again http://wiki.phoenixviewer.com/downloads then before launching the viewer, follow the steps on this page http://wiki.phoenixviewer.com/intel_vfs
Thanks to Justyn Tyme for the information