And the final resolution was: as SleepyDude correctly predicted faulty hardware. I had to change the hard disk (restoring factory settings, wiping the HD didn't help either). In the process I lost W 8.1 but at least computer works again!! Thanks for the help!!
W8.1 Asus ultrabook - update/freeze/downgrade to W8 issueW8.1; udpate error
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