If a standard reboot doesn't work, you must manually remove the folders that are confusing the installer.
Open and navigate to: %USERPROFILE%\AppData\Local\Google\ . If a standard reboot doesn't work, you must
"A partially deleted previous installation was detected. You must reboot your machine." If a standard reboot doesn't work
The computer, in its literal-minded wisdom, is more honest than we are. It refuses to pretend. It scans its memory, finds the leftover pieces, and halts the process. “You must reboot,” it says. Not “you might want to reboot” or “consider restarting.” Must. Because without a complete restart—without clearing the volatile memory entirely—the new system will never be stable. It will crash. It will conflict. It will eventually become as broken as the old one. in its literal-minded wisdom