May god be with you.
There is tons of confusion when using any Windows Media Center Edition or Tablet PC Edition. Some being, Media Center has about 3 different years available, and a mix of OEM and retail copies. Giving about 5 different CD sets.
Tablet is not far behind that, but AFAIK, never sold in a retail copy. Tablet was installed by certain manufacturers only and they all came out with there own way to install it. Either recovery on the hard drive itself, or recovery in a disk set. Trying to find an ISO Tablet PC will be next to impossible.
Are you sure the Toshiba set does not give a restore without format option?