Toshiba A-105 shuts off for no reason whenever it wants to

[Diana S]

Hello, my Toshiba A-105 laptop shuts off unexpectedly when I am downloading music or running my webroot virus scan. I tried to use the speed fan check but that freezes up the laptop. What's the problem or how to fix it.
Thx.

 

[r_manic]

Any other symptoms you can share? Off the bat I'd ask you to use memtest86 to check your memory.