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    +1 for logging activity; and for intuition. Not the accepted answer only because logging is only good if done from day 1. I have been keeping logs but not sufficiently detailed; and have not included system updates from Microsoft, and other automated updates. Commented Mar 20, 2011 at 20:28
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    @ChrisWalton: There are detailed logs for Windows Update, device insertion/removal, driver installation and so on. See C:\Windows\*.log, C:\Windows\Logs, C:\Windows\inf\*.log and also Performance Monitor > Data Collector Sets > (Startup) Event Trace Sessions. Also, @JRobert, +1 for explaining how to get an idea in more detail... Commented Mar 20, 2011 at 20:39