DVD boots UBUNTU but not Windows in any form

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Trying to fix a Toshiba that wont boot off the HD.  Bios finds both HD and DVD.  When I put in any version of windows boot disk (xp/W7), I get a "media failed" message and no boot.  The machine obviously spends some time reading the dvd.  I had a couple of versions of Ubuntu installation disks.  BOTH of these disks will boot the machine.

I am assuming I have some strange problem with the DVD, but have never seen something like this before.  I have ordered a replacement DVD for this laptop, but am baffled how it could boot one OS and not the other.

Any ideas.  I'm just curious since I have never seen anything like this.

[DaveLembke]

Do these windows discs work fine in other computers? ( this will test if its a damaged disc etc )

Do you have an external optical drive to bypass the (could be troubled) internal optical laptop drive and try to boot off the windows discs with if the discs are good?

[patio]

What exactly does it say on these Win CD's...or are they the "Sharpie" versions ? ?