iTunes not burning disks properly? ...

Being a DJ I need to burn CDs all the live long day but recently I've had some problems.
Once the CD has finished burning it no longer appears in the iTunes window under "CD" and sometimes it will not eject...
Once I do manage to get the CD out it doesn't play on many CD players and when it does. not all the tracks work and some of them have a "scratchy" sound in the background.
I need to get this sorted ASAP as I need to burn a batch of disks by 2moro.

Any ideas?

I've update iTunes and fully updated my pc (vista SP2)

Thanks

Dan.

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