When a Toshiba laptop freezes on start-up, it is often because of an incorrectly functioning master boot record or boot configuration. You should first try repairing the boot configuration through Windows' start-up options. If that doesn't work, you should repair the master boot record by using your Windows system CD/DVD. The boot recovery application turns into a powerful tool when you have start-up issues in Windows.
Start your Toshiba laptop and press the "F8" key before the Windows logo appears. This will bring up the Advanced Boot Options menu.
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Select "Last Known Good Configuration." This attempts a boot with the most recent configuration that worked for your computer before problems began. If this does not resolve the problem, continue to the next step.
Put your Windows CD/DVD into your Toshiba laptop and restart the computer.
Press any key when prompted.
Click "Next" when you reach the first dialog. Select "Repair Your Computer" and click "Command Prompt" after you finish selecting an operating system.
Type "bootrec /FixBoot" at the command prompt, then hit "Enter". Type "bootrec /RebuildBcd", then "Enter". Wait until both processes have finished and restart your Toshiba laptop.