Hello,
If you are using SuperFetch (Enabling Superfetch) it is possible that Windows has already loaded often used applications in memory in advance in order to provide a faster startup of the application. This can cause that “Windows” uses that much RAM even before you have started any program.
To get a good view of the processes that are currently running and how much memory they are using, use the Sysinternals Process Explorer tool and select some useful columns to display. (View -> Select Columns -> Process Memory)
Hope this helps you a bit!
