Recently I removed Windows Vista and installed Windows XP on the Toshiba A215-S7428. The Windows XP installation is complete and functioning properly. Due to the driver incompatibilities, this process was much more annoying than I thought it ever could be.
To get this to work, you have to pretty much forget the Toshiba site. It is mostly unhelpful and will send you over the edge. Instead, one must dig down deep into the operating system. One must manually edit driver inf files. One must deal with trying to find a driver for "Unknown System Device".
Fortunately, some unnamed kind soul has done all the hard work for you. I have been asked by unnamed kind soul to say the following: