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[eyore]

Yes, good idea!
Nero should also have a function to simulate a burn (without actually using a laser). Between the two tests it should, hopefully, find out what's wrong (burning the image to file may not pick up if the laser is capable of burning at the speed selected but will pick up if there's a problem with reading the file and doing the right thing).
I occasionally get a partial burn with Nero 6 on my old PC as it insists on trying to burn at the theoretical maximum for the drive/disc rather than the PC (it's a slow PC it's on).
You may have to actually uninstall iTunes rather than just reinstall over the top of what you have. i don't know what problems that would give you though. I only use iTUnes to buy things from, not to create playlists.

[HauntedPirate]

The symptoms suggest an I/O bottleneck between the hard drive and the burner.  I would try reducing the burning speed, this often can remedy disc burning problems.

Also, is the PC you're using newer, older, somewhere in-between?

[WDWBurghGooner]

I think you should really take a slightly different course here.
You need to get a free burner program to test the burner. You need to ensure that you get consistent burns using the burner to make sure it's not on it's way out (even new ones can go/be faulty, regardless of what I have said before and a lens cleaner may be all you need).
If you can burn half a dozen CDs without getting a coaster, you would, at least, be able to rule out the hardware.
The source files (Disney or other) are not going to be the problem. It's something within your PC and even with a failing drive you may still get occasional good results so it won't show what's wrong.
Are you quite certain you are not trying to burn at too high a speed?
Most new burners will set the burn speed as that stipulated on the Disc. They don't consider whether your PC is up to transferring the data to match. Even Nero will crash if the speed is too high regardless of the fact it has built in protection to seemingly prevent it.
What speed are you burning at?

THe speed is pretty low so I don't think that is the problem. I thought Nero was a burning program. Somebody suggested it in an earlier post so thats what I downloaded. Is it not the same thing as what you are calling a free burning program.

[WDWBurghGooner]

May I suggest you burn img files instead of wasting media.  Use Nero and create an img file on your hard drive. 

Thanks, I'll have to give that a try when I get home.

[WDWBurghGooner]

The symptoms suggest an I/O bottleneck between the hard drive and the burner.  I would try reducing the burning speed, this often can remedy disc burning problems.

Also, is the PC you're using newer, older, somewhere in-between?

Its about 18 months old.

[eyore]

Are you using a free trial version of nero or a version you picked up somewhere or maybe Nero Kwik Burn?
I was thinking more of a basic burning software (imgburn gets good reports http://www.imgburn.com/   ).
It's a little long winded but should be fairly foolproof and should confirm if the problem lies with the hardware or software.
Instructions here:
http://forum.imgburn.com/index.php?showtopic=5555
Nero is very particular what it shares the PC with and it doesn't take much to throw it. I've downloaded a number of alternative programs in my time that have reduced Nero to being useless (and some of them quite expensive).
What OS are you using by the way? Windows 7? 32 or 64 bit and what are the specs.
Remember we are looking at several possible causes and the suggestions are to try to narrow it down for you.
Just as another thought, is there anything running in the background that could be using a lot of resources on the PC? You have done a virus scan I trust, just in case there's something nasty there.
Also think of any programs you may have installed just before it started acting like this.