|Be aware too that a factory reset/restore wipes "all" files - including any personal "stuff" - the "stuff" you wouldn't wish to lose... So first copy all that "stuff" to external media - typically DVD at least; and ideally an external hard drive too. Check the copies are accessible too on (if possible) another working system as well as the one that made them.|
This is another way to invoke/use the compaq recovery partition to achieve what you want; a factory gate/delivery status again...
This is a link to a copy of the manual for your Toshiba; and will cover most things you may need to know; including factory resets via the recovery partition (or not...).
and this is the "official" toshiba support area for your model; includes "all" manuals etc (as downloads) for your model. Worth a visit/browse too?