Most PC/laptop users never actuallyinstallthe operating system!

However, there are some advanced users who keep installing new Windows or Linux builds as their work demands.

It simply involves opening the Task Manager and navigating to the Performance tab.

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Windows XP/Vista/7:click Start > Run, pop in CMD in the Run box and press Enter.

For example, Ubuntus installer creates log files at /var/log/installer when you install it.

Image result for windows uptime

Image result for windows uptime

Check out your Windows/Linux PC installation date using command line and uptime using task manager

If you have a Windows 10 PC/laptop, type in the following command into the Command Prompt window and press Enter

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source: www.techworm.net