It appears that the laptop fan is malfunctioning. This does not imply that the fan needs to be replaced. It is possible that simply cleaning the fan will resolve the issue. If the fan appears to be sufficiently clean, it may be time to consider replacing the fan. This is not an advanced task, and should help ensure that the laptop is again usable.
This is a hardware issue, but do not fear! It is simply time for you to consider replacing your hard disk. This is a quick fix, and will prolong the lifespan of your Toshiba device. It may also be time to consider upgrading to a solid state device to avoid further issues associated with hard disks.