I'm pretty sure this isn't right (memory usage problem)

I have 4 (3.2, thanks 32 bit OS) gigs of ram.
This is what my task manager usage history looks like:


It says over 700 megs and it is constant as you can see, yet all of the process in the task manager combined with Firefox running and "Show processes from all users" checked adds up to 200 megs.

Also, the memory calculations at the bottom right don't add up.

What do you think?
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More about pretty memory usage problem
  1. That's all as it should be. Have a read of this article, for instance, for an explanation of memory usage in Windows 7.
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Memory Usage Task Manager Windows 7