Not being supported by Microsoft shouldn't matter. As long as you don't use the box to go on the internet you should be safe in that respect.
Your CelebraNT is probably outdated/unsupported as well.
One of our presses has a Windows 95 box handling the scanning densitometer, there never has or willl be an update/upgrade for that.
As long as you are trying to keep using this software combo you will need to run XP/2003 Server. I would suggest finding an old computer to use as a backup for when your current one dies.