Windows keeps an Event Log that records details of pretty much everything that the operating system does. This includes every time it is turned on, turned off, and restarted. By analyzing the event log you can extract these details and produce a report into how often the computer has been used.
This can be a useful diagnostic tool, such as if you want to justify an upgrade or replacement. Or if you suspect that someone has been using a computer in your absence. Or even if you want to check that someone has indeed been turning up for work (if only to turn on the computer!). It's also useful as a way of estimating the energy costs for your office.
Unfortunately, the standard built-in tools for analyzing the Windows event logs are not good. But, to the rescue comes Nir Sofer and one of his excellent freeware utilities. This one is called Turned On Times View and you'll find it at http://www.nirsoft.net/utils/computer_turned_on_times.html. The download is less than 0.1 MB, it's malware-free according to VirusTotal and Web of Trust, and is portable too. Just run it and your report is generated instantly.
If you are on a network and you have permission to view other users' event logs remotely, the software can even pull in data from other computers on your LAN.
Give it a try, and see just how much your PC is being used.
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