Windows 7 does permit the creation of partitions after installation. This is one way that it's different from XP. It will assign a drive letter to the partition. If you can't change the boot order, you'd have to change the partition to "C:/" before you power down the computer. It seems like a do or die proposition, since you may not be able to get back into Win 7 if you do this. that supposes the the OS partition on your laptop is in fact "C:/"
I"m not familiar with Toshiba's recovery procedures, but it seems that it would be necessary to have the DVD drive first in the boot order anyway, if there are recovery discs involved. That is unless the recovery discs summon a fresh copy of Windows from an existing partition, perhaps "D/".
In some OEM installations of Windows, a BIOS administrative password prevents the use of actual Windows discs for an OS install. The recovery discs must be used, as they are a disc image, not really an actual copy of Windows
If you don't mind me asking, what's wrong with Win 7?