Why is my Windows 7 using so much memory?

Why is my Windows 7 using so much memory? Ok so I open the task manager, select show all processes from all users and about 20-30 processes come up totalling around 500mb usage max od memory, when I then click the Performance tab, it shows as 1.4GB being used! Where is it eating up all this extra memory? Is this a built in feature to reserve memory or something?
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Guest [Entry]

All this behavior is part of technologies introduced in Windows Vista such as SuperFetch and File Indexing. Your account of your available RAM and disk activity is normal and expected. I share with you similar numbers.