I have a previously modified XP ISO image with video drivers.

My question:
¿If i add new updated drivers, the old drivers are reemplaced or it have a conflict?

then, i can update the drivers into the ISO?.

If you have the old drivers from the previous one then I would remake it from scratch since this imo is the best option.

If you dont then there shoun't be a problem but I have never done it the way you are talking about im afraid i can't see any reason why it would be a problem and cause conflicts???

Hope this helps

Stoner81