I should probably be more specific too, going from Windows 7 to Windows 8.1, I lost a lot of my apps and had to re-install. My bet is this was one of the deemed 'incompatible' applications by Windows 8.1.
Also, this error pops up about 5 seconds after clicking 'Register' once I've filled in all the necessary info, first, last, email, company etc.
Hope this helps!