It would appear that there could be something defective with your harddrive or some other some other component of your computer. Please try running a diagnostic on your harddrive.Run hard drive diagnostics:
tacktech.comMake sure, you select tool, which is appropriate for the brand of your hard drive.
Depending on the program, it'll create bootable floppy, or bootable CD.
If downloaded file is of
.iso type, use
ImgBurn:
imgburn to burn
.iso file to a CD (select "Write image file to disc" option), and make the CD bootable.
For Toshiba hard drives,
see here:Note : If you do not know how to set your computer to boot from CD follow the steps
here