T510 4313 has 64bit windows 7 8gb but only has 2.99 usuable

I have a Lenovo T510 4313 and has 64bit windows 7 ultimate installed. I replaced both memory slots from 2gb each to 4gb each for a total of 8gb but shows 8gb installed but only has 2.99gb usable. Has anyone found a resolution for this?

Good afternoon.
Welcome to the community.
What do you observe if you try to boot the machine with only one of the 4GB sticks installed, and then again swapping them one for the other?
Regards.
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