Burn the Windows 7 Repair CD from link above, boot it and run Startup Repair up to 3 separate times with reboots to Start Windows 7.
If this fails, you can copy out files using this method: Copy & Paste - in Windows Recovery Console
Then run Toshiba Factory Recovery by booting the computer, then tapping key given on first screen or in Manual for Run Factory Recovery. Your manual can be read at Toshiba Support Downloads webpage.
Or you can find a Windows 7 installer for your version to clean reinstall Windows 7.