Where did some of the RAM go?

Question

Iron

The situation is the following.
The laptop has 6 GB of RAM, of which 2.4 GB is used.
In the system configuration, if you uncheck and enable the "use maximum memory" checkbox, sometimes the 6GB value slips, then you go in and again the same song. Did a reboot.

In the device manager, the situation is as follows, more than 3GB reserved by the equipment.

How to solve this problem, experts?

Answer 1

1) You have 32 bit Windows, to have more than 4GB you need 64 bit
2) part of the frame goes to the built-in video card, usually the size of this part can be set in the BIOS
PS: why install the left assembly of Windows?

Answer 2

64 bit system? discrete graphics card?

Answer 3

You have a 32-bit OS. To use all 6GB, you will have to install Windows x64