Change Analysis Diagnostic is a free utility download from Microsoft that reports system changes to a workstation. I immediately installed it and ran it on one of my computers, and guess what? It worked! It reported such things as an automatic update to my firefox browser.
Go to http://www.microsoft.com/downloads/details.aspx?familyid=097976f8-1124-45b8-9769-b48429a7a6a1&displaylang=en&tm to download and install the utility.
It does NOT create any icon or entry in the Program Start tab.
To run it, click on Start > Run and type: statechangediag.exe