My 2.5 year old 2.2GHZ P4 and 512MB RAM PC with Microstar M/Bd came with two optical drives, one is DVD read only and the other is a CD burner. I want to upgrade the machine and add DVD burner but on checking one of my Minasi videos today it seems I need a decoder card as well as the drive? The video was made in W98/NT4 days and I wonder if XP supports a software decoder because I have no more PCI slots left to instal a card having used them up to instal USB2 and NIC cards.

I would replace the present DVD read only drive with the DVD burner and I also intend to replace the CD burner with a faster one. I will be upgrading the ridiculous 150 watts PSU with something more appropriate.

Is this a feasable and simple upgrade or should I wait for my DVD burner when I hope to buy a new PC later in the year?