registry and file change utility
WhatChanged is a system utility that scans for modified files and registry entries. WhatChanged is freeware for personal and business use.
WhatChanged Portable works best with the PortableApps.com Platform
From the publisher: "WhatChanged is a system utility that scans for modified files and registry entries. It is useful for checking program installations. There are two steps for using WhatChanged: 1) First, take a snapshot to get the current state of the computer; 2) Second, run it again to check the differences since the previous snapshot. WhatChanged uses the 'brute force method' to check files and the registry."
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WhatChanged is packaged for portable use with permission from Vista Software.