If your Toshiba laptop has picked up a virus or is running slowly, you may want to reformat the hard drive so that Windows can run from a fresh installation. This will remove any files or preferences you've saved on the machine, leaving your drive completely wiped and ready for a fresh installation of Windows. You should never attempt to reformat the hard drives on your Toshiba laptop unless you're ready to install a new version of Windows.
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Back up any files, such as documents, pictures or music, that you don't want to lose. All your information will be lost when the drive is reformatted. Write down your 25-digit Microsoft Windows product key. This should be on a label on the bottom of your Toshiba laptop. If you can't find the product key, contact Toshiba for help. Microsoft will not help you find your product key.
Log on to the laptop with full administrative rights. Click "Start" and select "Computer." Click on the "Tools" drop-down menu at the top of the screen and select the "View" tab. Check the "Show Hidden Files and Folders" option and click "OK."
Click "Start." In the Search box at the bottom of the menu, type "winnt32." When the results have appeared, scroll to the bottom. Choose Search Again In and select "Computer" to search through the system files for "winnt32."
Double-click on "winnt32.exe." Follow the steps to reformat your drives and reinstall your operating system. At some point, you will be prompted to enter your Microsoft product key.
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