WHY DOES MY PC SAY MY MEMORY IS DOUBLE WHAT IT ACTUALLY IS?

Nice Of People To Respond To You!

Nice of people to be patient as well.

I would suspect that you have a 1024 RAM module but your BIOS is taking 512 as a GPU share.

How much RAM does your BIOS POST count? Check the BIOS Setup for Graphics options and Shared RAM.

You can also verify what exactly you have with CPU-Z:

http://www.cpuid.com/cpuz.php

Look under Memory as well as SPD.