What happen to my RAM memory?

I of late bought a new computer, Windows Vista, and it have 512 of RAM memory, then adjectives of a sudden a few weeks later i own 447 of RAM memory, is there any mode i could get my inspired RAM memory back?

Answer:
Maybe you hold onboard video card. It takes 8 - 256 MB memory out of your conventional RAM depending on BIOS settings own much memory can the VGA adapter use. In your case your onboard VGA take 64 MB of your RAM.
I recommend you to double your RAM. Vista runs best if there is at least possible 1GB of RAM. Also you have to buy separate video card close to nVidia or ATI, so that it will not use your RAM.
Windows Vista uses more memory, and Vista is still not stable, so it may show that as I read it somewhere.

512MB is very low memory for vista. I own another laptop with Vista beside 1GB and system uses average of 600MB memory just running IE. For Vista System, you must own at least 2GB of memory to run system worthy and fast.
The system is sharing some of its RAM next to the onboard video card, which can up or down, depending on the video card' needs.

If you want to reclaim the 'lost' RAM, bring a dedicated video card.

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