Look@Win is fast and easy to use. The first time you run the program, it creates a log of the files in your Windows and Windows\System folders, and the content of important system files, including the Windows Registry. Each time you run it thereafter, it compares the contents of the files and folders, updates the log, and reports any differences found. It also backs up your Registry and Windows system files.
Look@Win doesn't make any changes to your system -- it simply reports changes that other software installations have made to your system files.