I upgraded my toshiba laptop to Windows 10, then kept getting warnings saying hard drive is faulty and is going to crash. I've created restore discs ( but did this after upgrading to Windows 10) and I've totally reset my laptop to factory settings ( took over 24 hours) still getting same warnings . If I buy a new hard drive , how do I reload Windows? as the restore discs were created from Windows 10 and the key on the bottom of the laptop refers to the Windows 7 that was installed when I bought it .