I'm dual-booting Ubuntu 14.04 and Windows 10. I accidentally deleted the partition table for my main HDD, but was able to recover it. Now, I can't boot Windows. Thankfully, it was easy to reinstall Grub and boot Ubuntu.
When trying to boot Windows, there is an error message on a bright blue screen:
A required device isn't connected or can't be accessed.
Error code 0xc0000225
I tried pressing F8 for Startup Settings, but got this error:
The application or operating system couldn't be loaded because a required file is missing or contains errors.
Error code: 0xc0000225
I have already made a Windows install USB and tried using the recovery tools on it. Startup Repair didn't do anything at all. System Restore said to restart then select the OS but nothing happened after restart. Based on instructions here I went to CMD and ran
bootrec /rebuildbcd, which found my Windows install, but when I confirmed to add it to the boot list, it said something like the drive was inaccessible.
Edit: Changed some details above. Also retried the install USB but now it won't even start. It errors:
Your PC/device needs to be repaired. The boot configuration data for your PC is missing or contains errors.
Error code: 0xc000000f
Tomorrow, I will re-make the installation media then retry.