I had already scanned with Windows defender, spybot and Avast antivir. I did another on-line scan during dinner, but no positives.
There is another thing I just noticed, not sure if it is related. In explorer I suddenly have a Floppy drive listed while there is no physical floppy drive in my pc.
I remember seeing it this afternoon, but it didn't register in my brain until just now that it is new and not right.
Yesterday morning I put the computer into hibernation like always, it worked (as always) yesterday afternoon, but today it hasn't worked one time (and I tried a lot!).
I do not remember installing or changing system settings yesterday (which is not to say that I might have).