Kies is a software by Samsung which allows you to manage and upgrade firmware of Android devices like Galaxy S. It seems there is some bug with Kies, as many users are facing issues like error messages when trying to uninstall/remove Kies from Windows.
Thankfully, Samsung has looked upon and released an official uninstall program for Kies. This Kies uninstaller is a small .exe file which lets you easily remove KIES from your PC. After uninstalling Kies, download the latest version of Kies and install it.
Download Kies Uninstaller (87.4 KB)