As alvine stated you will need to go to Toshibia support. Most likely this will not be available as a download (Rather large and have to be an ISO so that you can boot to it), but as a Purchase of recovery disk(s).
The other option is to:
1) Download all the drivers from Toshibia (just go to Tosihiba downloads for your Laptop and any software listed.
2) For windows 7. If you have a windows 7 installation disk, or can barrow one.
Install windows 7 - DO NOT put in a Key during installation. When Installation is complete and the drivers / software is installed, Then input the windows key for YOUR laptop and activate.. This is legal as it is the Key that the liecience is tied to.
3) happy with installation - Then use windows 7 to do a backup of your OS using windows 7 Backup (located in control panel). Back-up image can be placed on a external HDD, or a set of DVDs (normally about 3->4 disks). When image is completed you will be prompted to insert a DVD to create a Bootable rescue DVD. This will allow you to re-install OS+Drivers +Programs in the future.
It pays to follow the warning - CREATE YOUR OWN recovery disk when first powered on.
Many Toshiba laptops come with the factory software recovery image stored in a special (hidden) area on the hard disk. From this special hidden image, you can restore your computer to its factory-fresh software condition by following these steps:
To restore the original factory software image on your computer follow these steps:
Make sure the computer is turned off ("Shut-down" from the Windows Start menu)
Remove any peripherals such an external mouse, keyboard, monitor, USB flash drive etc.
Make sure the AC Adapter is plugged in and working.
Press and hold down the 0 (zero) key on the keyboard while powering on the computer. Release it when the recovery warning screen appears.
If the recovery process offers a choice of Operating Systems, select the appropriate one for you.
A warning screen appears, stating that when the recovery is executed all data will be deleted and rewritten.
Click Yes to continue.
When the Toshiba Recovery Wizard opens select "Recovery of Factory Software" or the appropriate option for your needs.
Continue to follow the directions restarting as necessary.
Please note that the process may vary slightly from machine to machine, that you may be asked to insert disks (multi-disk packages) and that the process may take one to two hours to complete. The recovery process will require you to restart your computer several times.
As you use the recovery process you will have several options. One of these may be to create a custom size partition. Follow the directions on screen for this and other options as prompted. When in doubt, it's usually best to accept the default, or pre-selected option.
Once you get back to Windows, create a set of recovery DVD's in case hdd goes bad.