Thanks for confirming
I still suggest that the HDD is tested, we know it is is a Toshiba HDD but their diagnostic tools are limited to Fujitsu and Vista so use Seatools as it works well on most brands, see canned text below;
BTW, do you have a Windows 7 or a system restore disk in case one is needed for a Repair installation, no worries if not as long as you have your product key you can download an ISO if need be.
Run the HDDs diagnostics tool;
Depending on the program it'll create a bootable floppy or a bootable DVD/CD.
If the downloaded file is the .iso type use ImgBurn to burn the .iso file to a DVD/CD disk depending on your OS (select "Write image file to disc" option) and make the disk bootable.
RE ImgBurn: please use the custom install and uncheck the attached foistware such as "Install Entrusted Toolbar etc