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.