first of all forgive me please for my broken kitchen English, I am a French speaking guy, but since I can not get any serious help in my mother language, well here I am...
This Toshiba A-505 was made for Windows 7 Home Premium.
I have accepted the upgrade proposed by Microsoft, to upgrade for free from that Windows 7 Home Premium to Windows 10.
During the first +/- 10 weeks, everything was ok.
After a certain Windows Update, this laptop - and another one as well ( a Packard Bell EasyNote TK-85, also originally working under Windows 7 and upgraded to Windows 10 ) were equally infected, but with different symptoms.
The Packard Bell EasyNote TK-85 is now in the hands of a friend of mine, looking for a way to fix some of these problems : hard disk unreadable, unwrittable, unformattable, laptop non-stop switching on/of all alone by itself...
The symptoms of the Toshiba A-505 I am still able to use in order to write this post :
first freezing at any moment for a few seconds, then switching off by itself.
When I say -at any moment- more often when I ask the laptop the slightest effort, like installing a software, using a software, opening 2 or 3 Internet windows simultaneousely ...
I already have made some test that people advice me to do, to check the hard disk health, the memory, etc : no problem.
The same people repeat the same thing : a virus via Windows Update is IMPOSSIBLE.
It is maybe impossible, but ... it happened, and not only once, but twice. Maybe more ...
The guy who have posted a YouTube video tutorial to explain how to recover the Toshiba A-505 as coming out the factory, said exactely the same thing : he was forced to do so, because of a virus he get after a Windows Update, after ugrading his Toshiba A-505 from Win7 to Win10.
I first used the internal Toshiba recovery system to erase the hard disk ( writting on existing data ) :
23 hours long, WITHOUT any freezing nor crashing ... Strange ... before re-installing the original Windows 7 Home Premium.
In vain : the symptoms are still there, I suppose they were hidden in the recovery system ...
Now I am using a Windows 10 Professional version 1511, same symptoms are still there...
I have read the first exchanges of this issue : http://www.bleepingcomputer.com/forums/t/487822/possible-infection-causes-computer-to-freezecrash/
So, to avoid a waste of time, here are the attached files with the results of the required reports.
I thank you in advance for your time and kind attention.