Sorry I took a while to get back I was just checking a few things out.
OK spec - XP Pro , AMD Athlon 2079MHz 2800+ , nVIDIA nForce 2 IGP , 480 MB DDR SDRAM, MSI MS-6777 MOBO.
DVD - ATAPI DVD-ROM 16X Max.
I ran the system file checker and all was OK.However when I just clicked on the drive in device manager and clicked the DVD Region tab , under 'Current Region' it said 'Not selected' , so I selected UK (Region 2) and when I clicked OK it said 'Unable to update region setting.Please make sure the drive contains a region 2 media and you have administration privilege.'
I am not using either of those , the only DVD related software I have at the moment are WMP and Nero 6.Are you saying that unless I do as ashdev suggests and use WMP with the codecs then I have to use either WinDVD or PowerDVD ?
I did originally have PowerDVD installed on this PC but because of various reasons I had to format and re-install Windows , the only problem with that was that the PowerDVD software was installed when I purchased the PC and I now cannot ask the company to reinstall as it is a TIME PC and they have gone bust !
Leave Nero in. It will probably work better after you've installed following my link (scroll to the bottom. There's an update). Don't use Nero to watch DVDs. It's a bit flaky. Especially if you've not got a lot of ram.