Win8.1 upgrade win10 error 0x80070002 how to do

One of the reasons for this problem may be because of the addition of another drive. According to an industry insider in the Microsoft community, if your computer used HDD mechanical hard disk as the primary hard disk and later added and enabled the second hard disk, such as SSD solid state hard disk as the primary hard disk, it may lead to Win10 installation. The program does not recognize the current partition information well, causing the installation to fail.
The solution is not difficult, the easiest way is to back up the useful information of the previous master hard disk, then re-partition and format it, to avoid residual boot information to disturb the Win10 installer. Or remove the non-bootable hard disk before installing the system, and remove the installation. After installing it, you can solve the problem by connecting and installing.
Another reason is the interference of non-Microsoft services. The solution is to prevent all non-Microsoft services from starting. You can enter MSConfig in the "Run" dialog box and enter "System Configuration" and then find "Services".
Click on the bottom left corner to hide all Microsoft services & rdquo; and disable all services that still exist. Then restart your computer and try to run the installer again.

In addition, some third-party anti-virus software and security software may also hinder the normal operation of the installer, resulting in a similar situation. Therefore, in order to be on the safe side, you should disable all the real-time monitoring programs for killing soft before upgrading Win10, or even temporarily uninstall the soft-software. After the Win10 upgrade is successful, you can re-install it.