CD Extra Problem

I have a little problem with my cd-extra discs. In that they used to be recognised OK on my computer drives, until recently. I have a 2 year old Sony Vaio running XP, and also have an external DVD/CD Lacie drive.

I simply cannot understand, why for no reason, windows or any other software refuses to recognise the video tracks on the cd-extra disc. These are commercial discs, and not ones that I have created myself. Only the audio tracks are now shown for the disc.

Can someone please help? :sad:

Sam

are they karaoke disc