WinMerge is an Open Source differencing and merging tool for Windows. WinMerge can compare both folders and files, presenting differences in a visual text format that is easy to understand and handle.
* Microsoft Windows 98/ME/2000/XP/2003/Vista/2008
* Microsoft Visual C++ 2003 Runtime Components (included in the installer)
* Admin rights for the installer
Download: WinMerge 2.12.4