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.
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.
source: www.techworm.net