Hi
If nothing else works...
If you have data on the computer that you need to retrieve you can probably access it using a Ubuntu OS disk.
It will let you copy the data to an external hard drive or DVDs.
You can download the ISO file from...
http://www.ubuntu.com/download/desktop
You will need to burn the ISO to a DVD using Imgburn...
http://www.imgburn.com/index.php?act=download
A Ubuntu disk is a handy thing to have around, mine has booted every computer I've ever tried it on, from Windows XP to 8.
Once your data is secure you can safely go ahead...
The Toshiba Satellite should have a restore partition that will set the computer back to it's original configuration.
I copied this from the Toshiba website...