Integrated graphics card...
Integrated graphics card uses up some RAM resources...
Take a look at your laptop specs.
For example, you have 512MB of RAM.
You have a 64MB integrated graphics card.
512 - 64 = 448MB
When you check your system properties, it will show 448MB as the
amount of RAM you have.
Your BIOS shows the actual specs of the PC, while system properties
detect everything on a "as-is" basis, that is whatever it finds, it
reports.
