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Old 24. Feb 2015, 04:26 PM   #2 (permalink)
torres-no-tan-magnifico
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sobi, welcome to the forum!

The rescue disks you have tried work on W7 because the firmware installed is BIOS; however, the firmware in W8.1 is UEFI.

More info here: http://windows.microsoft.com/en-GB/windows-8/what-uefi

I'm presuming that both of the notebooks have malware; if that is the case please read this article: http://www.techsupportalert.com/cont..._Bootable_Disk

HTH
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