What's your Windows version?
In the Device Manager, what are the drives listed under "Disk drives"
and "DVD/CD-ROM drives"? Your hard disk should be listed under "Disk
drives" and your cd/dvd drives should be listed under "DVD/CD-ROM
drives". Is the Toshiba hard disk?
If your hard disk is listed under "Disk drives", right-click all the
drives listed under "DVD/CD-ROM drives" and choose "Uninstall". Then
reboot and let Windows find and reinstall the drives.