On Windows computers, this error means there is a problem with the permissions of your %TEMP% folder. This folder is used by several applications, including Dropbox, to start up, install, and uninstall.
To fix this issue, you'll need to give your user profile "full permissions" over the %TEMP% folder.
Change permissions for the %TEMP% folder
- Open a Windows File Explorer (not Internet Explorer) window.
%LOCALAPPDATA%into the navigation bar (include the percent signs).
- Right-click on the Temp folder and select Properties from the pop-up menu.
- On the Security tab, select your user name in the list and edit the permissions so that you have full control of the folder.
Please note that the dropbox user is a placeholder, you should instead look for your own user name.