It ain't 'tough' for me. The 'Win' in 'Wincustomize' stands for 'Windows' aka Microsoft's OS [plural].
It's quite pointless to 'despise' the provider of the [vast majority of] Operating Systems in use, but, on the other hand it's not all that 'difficult' to 'point the bone' at Symantec when the latter's record is somewhat less than exemplary. It seems NAV can do as much to harm a machine as to help it...