Lenovo screen resolution report! Help!

Can anyone help me out at this case?

I just baught a new Lenovo Laptop here is it's model:

Model: Lenovo 4446 3FG

When i Change the screen resolution to 1024 X 768 , There are two black squares appear at the right and left side of the screen
like this: http://img294.imageshack.us/img294/6384/73058733.jpg

Can you tell me why is this?

When i play some games , this two black lines appears when the game can only be played under 1024 X 768 resolution.
By the way resolution 800 X 600 is the like 1024 X 768 resloution on this condition.

Another issue am worried about , the computer store man told me the Graphics card is: 256 MB
but when i looked at Advanced settings i see this:

Total Available Graphics Memory: 1292 MB
Dedicated Video Memory: 32 MB
System Video Memory: 32 MB
Shared System Memory: 1228 MB

Can you tell me what is the true Graphics card?

Or does the store man lie to me?

Thank you very much.

 

It has the black bars because you're running a 4:3 resolution on a 16:9 screen, instead of stretching it, it adds the black bars to keep the aspect ratio (like movies add bars to the top and bottom on 4:3 television sets).

Your graphics card has 32 mb of dedicated chip memory, it can share memory from your RAM up to 1292mb