What kind of error are you getting? The missing dll one or something different? One thing to try is delete the Fritzing tmp directories which on Windows are in
(where windows_user is your windows account name and this is a hidden directory so you need to enable displaying hidden directories in explorer) and
reinstalling the zip file does not affect these two directories and if something gets corrupted in them that can block the installation. Fritzing will recreate them if they don't exist. You might also try disabling Antivirus when installing in case your AV is deciding something in Fritzing is a virus.