I have a friend that had purchased a PC with Wndows 7 preinstalled. It was a Compal QAL51 w/ Insyde bios Rev 3.7. Ever since Windows 10 came out, he was itching to use it. He asked me to wipe his AHCI harddrive and throw Windows 10 on it. I did some research on Compal's QAL51 and did not find any Mainboard drivers for Windows 10. I threw the dice and installed windows 10 anyway. Most of the time his PC powers on the laptop it immediately goes into Revovery Mode: Code: Recovery Your PC needs to be repaired. The application or operating system couldn't be loaded because a required file is missing or contains errors. File: \windows\system32\winload.efi Error code: 0xc0000225 You'll need to use the recovery tools on your installation media. If you don't have any installation media (like a disc or USB device), contact your system administrator or PC manufacturer. Press Enter to try again Press F8 for Startup Settings Press ESC for UEFI Firmware Settings Sometimes its winload.efi, sometimes its another file. At first I thought it was something to do with the BIOS (TMP Management), but I don't know. Other times I thought it was an Azalia controller issue (win10 drivers that compal doesn't have?). So I don't know if its a bad harddrive, or the BIOS having SLP keys for Windows 7, or windows 10 TPM Manangement software, or a device driver issue. Has anyone else out there dealt with laptops that acted like this, when upgrading the OS?