Question on my RAM

I have a 64bit OS + have 4 gigs installed ..

Shouldn't my full RAM be available to me rather than just 3.75 (useable) ?

:confused:

Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 3.75 GB
 
what kind of computer is it? It sounds like 256MB is being reserved for video.
 
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