your "Total Physical Memory" is what is installed.
Your first one says 1.00GB.
Your second one says 768MB

The second one is obviously using part of a GB for an onboard video card.
If you can add more memory you will see a significantly better system
performance.
The same could be said for both systems.

I have 2.5GB in my desktop and I still have freeze ups from time to time.
Mostly due to adobe flash.