Windows
0x80070002 The system cannot find the file specified
What it means
0x80070002 is the Windows error code for a missing file (ERROR_FILE_NOT_FOUND). Something expected a file at a path and did not find it. In Windows Update, that often means a component of the update package is missing or could not be written.
Where you usually see it
Windows Update, software installers, and scripts that point at a path that has moved. It also appears when a temporary file was cleaned up too early.
What to try first
If this was Windows Update, restart and try the update again. If it fails in the same way, use the official Windows Update troubleshooter. If this was an installer, download a fresh copy of the installer from the software maker, and avoid copies from a random third-party "mirror".
When to stop
Deleting Windows folders by hand to "clear the error" is a good way to create a new one. This page does not recommend command sequences you cannot read.