I replaced my vista install on a Dell Inspiron 1525 with XP and have managed to get most things up and running again however I'm having trouble with playing DVDs.

When I try and play a DVD I get the following message:

Windows Media Player cannot play this DVD because there is a problem with digital copy protection between your DVD drive, decoder, and video card. Try installing an updated driver for your video card.

I have ensured that my drive is configured to play Region 2 discs (I'm in the UK), I've installed the most up to date XP codec pack which makes me think it's a driver issue.

In device manager I have got my DVD drivers up to date however under "Other Devices" I'm missing several which sound key:

Audio Device on High Definition Audio Bus Modem Device on High Definition Audio Bus Video Controller Video Controller (VGA Compatible)

However I've installed all the relevant drivers I can find on the Dell website.

The drive itself is working - I've run software from the drive.

I'm afraid I am far from a sys-admin so I'm struggling on this one. How can I get my DVDs playing again?