"A partially deleted previous installation was detected. Please reboot your machine and run the installer again."
The steps above are general and might need to be adapted based on the specific software or service you're using. If you have more details or a specific scenario in mind, providing them could help yield a more tailored solution.
If the files are gone but the error persists, the "partially deleted" flag is living in your Registry.
Navigate to %USERPROFILE%\AppData\Local\Google\ and delete the DriveFS and Drive folders.
Unfortunately, simply rebooting rarely works. The error indicates that the uninstaller did not clean up after itself, leaving digital "scraps" that block the new installation.
: If you're trying to upload or sync files and encounter this error, check if there are duplicate file names or if a file/folder is partially synced and then interrupted.
If you have tried all 7 methods and still see "A partially deleted previous installation was detected," gather logs: