While I do build with WinXP support, and some users are able to operate DGDecNV without issues under WinXP, I no longer provide support for this use case, especially with older and low-end cards. One reason is that due to such conditions, users cannot run with the latest nVidia drivers. To evolve DGDecNV I cannot hogtie myself by requiring perpetual support for dead operating systems and ancient video cards.
Running DGDecNV under a virtual machine is also not supported because virtual machines do not support my licensing scheme.
Support for WinXP and virtual machines
Re: Support for WinXP and virtual machines
WinXP support is now formally dropped and DGDecNV is no longer built with XP compatibility.