msinfo 32 and RAM?

[WesGN]

I just bought a new computer here are the specs first:
==========
ECS Mainboard KT266a(ver: 2.0 VIA chipset AMD XP ready)
2 sticks of 256 mbs of DDR PC2100. (Micron and Samsung)
Maxtor 60gb 7200 RPM 8.7 seek time
G-Force 2 Pro 64mb (not overclocked)
AMD Athlon XP +1700 (not overclocked)
Sound Blaster Live Platnium
==========

Okay, as I boot up my RAM reads out as 512 with some other numbers (as normal). When I enter Windows XP Pro I run MSINFO32 and it says that my Total Physical Memory is only 384.0. Now here is what gets me. When I go into my Device Manager it says I have 512 MB of Ram installed.
Is this a bug in MSINFO32? Or am I doing something wrong here?
Please help if yah can. Thanks for your time.

 

[PUDBUDZ]

....Is that the amount of free ram?

 

[WesGN]

Doesn't say whether it is free or not but I could be wrong.
It says: Total Physical Memory: 384.00 MB
Underneath it says this: Available Physical Memory: 389.63 MB

I just dont think thats reading right because I have 512 mb of DDR pc2100 mb. =(

 

[SC|SSORSS]

start-run and type systeminfo


Still at 384 ¿