Here we are almost five months later and this same issue is confounding I dunno how many thousands of folks as evidenced all over the Internet. I have a Acer Aspire V5. Updated BIOS succesfully at Acer site, got al Windows updates including optional ones, turned off antivirus...I have spent hours and hours on this. It gets as far as downloading, analyzing, updating, gathering info, and then "we're installing Windows 8.1 We'll let you know when we're done". Then much later, "This app wasn't installed. Something happened..." Very useful information - not! What is the friggin deal with this?