Usually if changing hardware your pc should pick it up straight away. Only thing needed to be installed is PowerDVD.
If it is XP you will need PowerDVD XP or Similar. You could try going into program compatibility wizard to make it run as win 98.
Make sure you have the latest drivers for you g.card.
You want the 43.51 whql drivers, not the uncertified ones.
Also bios update
Also maybe you may need the latest via drivers. 4.46 You might not require these.