Adding up A0 and A1 doesn't equal the total, but more than that you're talking KB adding up to MB when every every computer in the last two years should have at least 512MB. (Correct those units to make that 1024MB = 1GB)
To clear it up, press Windows + R and typewinver before clicking OK. At the bottom it should state how much physical RAM is present, in KB.
Then, when determine upgrade options, find you either the motherboard or computer make/model number...there's always a limit to the amount of RAM it can handle.
I was thinking abut getting new RAM for my computer, but before committing to the sale on Amazon.com I ran Belarc Advisor. It says that I have 1024K of RAM, but then it says there is 1024K in A0 and 1024K in A1, with A2 and A3 empty. Now, should one of those sticks be in A2 so that I actually have 2MB of RAM? Also, my computer is around 2 years old. Would it be worth it to buy new RAM? I'm thinking of a pair of Corsair sticks. Thanks.