while I have 4 gb installed. Previously I had 3 gb available but now for some reason only 2 gb. I understand the 3gb limit with Vista, but how do I get the OS to recognize the 3rd gb? The BIOS of my ASUS p5b MB reports the 4gb.

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try and add /3gb to boot.ini

did u install any new video card recently, this may utilize more ram, if not, do the thing that jbennet suggested.

This is a known issue; I have an e-mail from a supplier that I think lists the cause and solution to this on my desk at work - will post it tomorrow for you if I remember to bring it back.

What's the make and model sorry?

Dazza :cool:

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