List of changes from version 1.1 from Ilfak Guilfanov at Hex Blog:
Version 1.2: if the hotfix has already been applied to the system, informs the user at the second installation attempt. Version 1.3: added support for Windows 2000 SP4
If you have already installed version 1.1 you do not need to reinstall. This path should work for Windows 2000, XP 32-bit, XP 64-bit, and Windows Server 2003.
Note: When MS comes out with a real patch, simply uninstall this from Add/Remove programs on the Control Panel.