I have 3GB of RAM installed but the system only reports 2814MB

3GB RAM on Vista 32-bit Home Premium and system info is only reporting
2814MB. The motherboard bios is recognizing all 3GB and the memory has tested
fine when only 1GB or 2GB is installed on it's own. The memory is all the
same - Corsair - same product line and everything. Vista OS is up to date and
I am using the latest bios for my motherboard. I will paste the system specs
here.... (Any idea what could be going on here?)

OS Name Microsoft® Windows Vista™ Home Premium
Version 6.0.6000 Build 6000
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name (i removed this)
System Manufacturer System manufacturer
System Model System Product Name
System Type X86-based PC
Processor Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz, 2400 Mhz, 2
Core(s), 2 Logical Processor(s)
BIOS Version/Date Phoenix Technologies, LTD ASUS P5NSLI ACPI BIOS Revision
1401, 5/29/2007
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.0.6000.16386"
User Name
Time Zone Eastern Standard Time
Total Physical Memory 2,813.75 MB
Available Physical Memory 1.76 GB
Total Virtual Memory 6.64 GB
Available Virtual Memory 5.65 GB
Page File Space 4.00 GB
Page File C:\pagefile.sys

Name NVIDIA GeForce 7950 GT
PNP Device ID PCI\VEN_10DE&DEV_0295&SUBSYS_C6363842&REV_A1\4&36A AE60&0&0010
Adapter Type GeForce 7950 GT, NVIDIA compatible
Adapter Description NVIDIA GeForce 7950 GT
Adapter RAM 256.00 MB (268,435,456 bytes)
Installed Drivers nvd3dum.dll,nvwgf2um.dll
Driver Version 7.15.11.6375
INF File oem27.inf (nv_NV3x section)
Color Planes Not Available
Color Table Entries 4294967296
Resolution 1680 x 1050 x 59 hertz
Bits/Pixel 32
Memory Address 0xC6000000-0xC8FFFFFF
Memory Address 0xB0000000-0xBFFFFFFF
Memory Address 0xC7000000-0xC7FFFFFF
I/O Port 0x0000A000-0x0000AFFF
IRQ Channel IRQ 16
I/O Port 0x000003B0-0x000003BB
I/O Port 0x000003C0-0x000003DF
Memory Address 0xA0000-0xBFFFF
Driver c:\windows\system32\drivers\nvlddmkm.sys (7.15.11.6375, 7.27 MB
(7,625,088 bytes), 10/4/2007 6:14 PM)

Any idea what is going on here?