Hello Mano .
As it is seen, the cause of your crashes are win32k.sys (C:\Windows\system32\win32k.sys) which is usually obtained from windows updates.
I would suggest you to run SFC /SCANNOW Command - System File Checker
, and accept the repairs.
At the same time, I would also suggest you to run Memtest for a reasonably long time . RAM - Test with Memtest86+
and, download and install Speccy
, and notice the temperature generated by the system. If it is generating a high temperature, revert back from any overclocking.
Most important, update your codecs. Download and install http://shark007.net/
, the latest version.