In accordance with it I reconstructed my topic as follows.
My issue started on Jan.16, 2014 by sudden system closing in a „STOP Blue Screen” followed by auto restart and so on endlessly. Due to very high frequency of this I cold not read the message on blue screen.
I moved to safe mode and found the system is stable and working.
Then I tried to restart at the latest known good performance. No cure.
Then I tried to go back at a restoration point on Jan14, before the issue. No cure.
I selected a restoring point in Dec. 2014. Also no cure.
All time in safe mode, I created a supplementary page file of 1000 M in partition D. Result : Blue screen became stable and auto restarts ceased. So I could read the error message on blue screen
In safe mode I used the Windows Tools to check the system. It returned everything is OK. Device Manager shown all devices and their drivers are healthy, despite my HP printer and external USB flash drives are not „read” by the system.