Thanks for the attention
Well I don't know what to say. I'm copying files and then - Blam! the system
re-boots. After the system re-starts nothing appears in the event log before
the crash but afterwards I can find "The computer has rebooted from a bug
check. The bugcheck was: 0x0000007f (0x0000000d, 0x00000000, 0x00000000,
0x00000000). A dump was saved in: C:\Windows\MEMORY.DMP."
It doesn't mean anything to me.