The following article shows how to do a repair install of Win 7 Repair Install - Windows 7 Help Forums
which will get you back in but you may need Toshiba's generic product key to activate as the COA sticker only applies to the OEM install and may be rejected.
I'll PM you the key.
Once you're back in you can back up your personal files and try the factory reset again, from Start type diskmgmt.msc
- press Enter to check that your Data D: partition is still showing as using ~10GB.
What do you mean by having 4 CDs of software ?