We get this question often lately. Here's the scenario:
I was trying to re-size or copy my UEFI (Unified Extensible Firmware Interface) for one reason or another and now I can't boot my Windows 8 or 8.1 PC.
There are some free software solutions out there some seem to work some don't. Most often when we receive this question the user has tried to use the Windows Copy command and the Windows Disk Management Tool (WDMT) to copy the UEFI partitions contents to larger partition, then uses the WDMT to delete the old UEFI partition then re-size the new one, set the new UEFI partition to active and then re-boot. This is were the trouble starts. At this point the BCD store is corrupted and the system will not boot. Here is a fix that I hope will help.
Firstly, boot from a Windows 8 recovery drive (CD/DVD/USB). If you don't have a recovery drive (and this is likely because most new machines don't come with one), then you will either have to install the drive into another Windows 8 machine or obtain a Windows 8 rec