windows explorer restart

After installed Avast! free antivirus 2015.10.2.2215 Sp1 windows explorer is restarted 3 times a day.I am useing windows8.1 pro 64bit.I Performed a clean install.Ondemand Scaner is Malwarebytes Anti-Malware Premium 2.1.4.1018.Is it virus effect or anyting else?Pls help

Let’s see if we can find something.
https://forum.avast.com/index.php?topic=53253.0

Hi! Eddy.I am posting Malwarebytes Anti-malware Scan log.But Malwarebytes not found anyting. what to do next?

Run the other scans as well (Farbar and aswmbr) and attach the log files.

Ok i ran (Farbar and aswmbr) and attach the log files

what to do next?@Eddy.

Start with removing all illegal software from your system.

Removing all illegal software???

Run Farbar again and attach the new logs.

Ok. Attached the new logs

Try disabling MBAM active protection

Not Solved.Pls help me.@essexboy

Next run SFC :

http://www.thewindowsclub.com/how-to-run-system-file-checker-analyze-its-logs-in-windows-7-vista

Anyting not found.what next?

What are you doing when explorer closes ?

i am see a movie.when this happened everytime it close all of the background process and windows media player/Km Player.Even stop copying process of files(Movies,Documents etc.).

Total physical RAM: 2013.24 MB this is probably the cause insufficient RAM is causing windows to shutdown tasks

Update to at least 4 GB

No shutdown.Only windows explorer restart@essexboy.

As I said before, start with removing ALL illegal software and such.
keys.for.eset.nod32.kaspersky.avast.dr.web.avira.02.02.15.torrent
top.paid.android.apps.games.themes.pack.23.march.2015.android.zone.torrent
Microsoft Office 2010.rar

Remove the software from the IObit thiefs also.
https://forums.malwarebytes.org/index.php?/topic/33217-iobit-theft-conclusion/

And stop downloading movies illegally.
They are not trusted and can/will bring you trouble.

What is IObit thiefs? and i use only iobituninstaller.this is a free version and i just removed it.one more thing i do not download movies illegally.just watch free movies on Youtube not downloaded any movies.@Eddy.thanks for saying “They are not trusted and can/will bring you trouble” i knew that.Now what i do with this problem?