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Possible Duplicates:
Why does Windows only show about 3.5GB of my 4GB+ of RAM?
Why can't Windows 7 x64 use all installed memory?

On Acer 1830t notebook with 4GB RAM (Intel HM55 Express + Intel GMA HD) and custom Windows 7 install Intel® HD Graphics utility reports

Physical Memory:        2869 MB
Minimum Graphics Memory:    128 MB
Maximum Graphics Memory:    1306 MB

There's no BIOS setting to disable shared video memory.
How do I bring RAM back to 4GB?

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marked as duplicate by Tom Wijsman, ChrisF, Majenko, nhinkle Apr 15 '11 at 23:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Was the custom Win7 install a 32bit version by chance? – SnOrfus Apr 15 '11 at 22:42
It can also be that the Graphics is using up the missing main memory as shared video memory. Not much you can do if this is the case, unless the driver allows you to trim it back, it would be found in Graphics properties if it exists. – Moab Apr 15 '11 at 23:18
1 vote for being closed prematurely. At least let the OP post if it is 32 or 64bit. Specs say it is… – Moab Apr 15 '11 at 23:27
@Moab still a dupe… – Sathya Apr 16 '11 at 4:00
@Moab "pity voting" is not encouraged, though you are free to vote as you see fit. As @Sathya points out, the question has still been asked before regardless. – nhinkle Apr 16 '11 at 6:56

It sounds like you're running a 32 bit version of Windows. This is a limitation of the 32 bit systems (and certain 64 bit systems, depending on the motherboards chipset) that limits how much RAM is available to the operating system. Here is a good discussion of the issue:

The 3GB-not-4GB RAM problem

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