Try a new DVD drive and also remove and reinstall the DVD player software.
Also worthy of updates (not from Microsoft!) are motherboard, video, audio drivers.
Bob
Hi for some reason dvd-r disks will not load anymore on my comp,the screen locks up and the only way to get it back is to eject the disk,I have recently installed XP Pro SP 2 on could this be something to do with it ,also have a Trogan horse in some files that I cannot get into ,that I cannot get rid of ? any help would be appreciated as not very good with this sort of thing,thanks Phil

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