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Welcome to Seven Forums,
If you have a 32bit OS and your computer has 4GB RAM there is an address limitation and you will only be able to use somewhere between 3.2 to 3.5GB of your RAM. Other hardware will use some of this address space.
If you have a 64bit OS and 4GB RAM you will see less because other processes use some of the RAM.
Check your Task Manager to see what is using it.
Right click your taskbar, click Start Task Manager, click the Precesses tab.
Here you can see what your memory is being used for.
Click the Performance tab, this is another view of what your RAM is doing for you.
The 3.44GB usable means .56GB is currently being used by your computer to run processes, you have 3.44GB usable or available for doing anything else you might want to.
This is normal, everything is good.
Edit:
The (3,44 GB usable) does indicate not all your RAM is available to your computer.
This has been clarified in another thread, the fix was go to"under msconfig > boot > Advanced options > Max Memory" and un-check the Max Memory box.
Last edited by Dave76; 07 Oct 2009 at 06:06.