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There are 2 types of memory, one for laptops and one for pc.
Your additional stick seems to be for pc from what your saying.
Additional thoughts: I'm sure you can buy sticks for laptops at walmart or whereever you bought ur laptop. Just make sure it is the same speed type. Example: yours is 512mb ddr PC 5200, you will need to find PC5200, the 512mb and up you shouldnt have to worry about. So do your research before you upgrade or you will burn your laptop.
Ram should always be paired. Same type, speed and size in each slot. You may have 1 SIMM/DIMM/DDR that has 2 sides of chips and the other with 1 which will do exactly what you state.
RAM reads across the chips simultaneously. So if you have a different one in each slot it can go bonkers and do goofy stuff on you.
I dont know this particular model, but usually it's underneath the computer, there is one screw to remove and you can take out a door which gives you acess to the memory slots.
If it's not there, you will need to remove the top cover to get there. But it's most likely a small door underneath the laptop.
usually under the bottom of the laptop there are some covers, the memory will be under one of them. To see what to look for follow this link: http://img.zdnet.com/techDirectory/_MEMMOD.GIF To find a compatible module run the tool from crucial http://www.crucial.com/systemscanner/index.aspx
Each memory slot on the C555NR can support a maximum of 1GB of RAM. There are actually 2 slots, but only one is easily accessible to you. By upgrading both the primary and secondary DIMMs, you could achieve a total of 2GB of memory but you would have to remove the 512mb chip that is already installed and replace it with 1GB (+1GB in the expansion slot as well.)
If you don't plan on taking the computer to a professional to be serviced, you will probably only want to upgrade the memory in the secondary slot located under the memory cover on the underside of the computer. It can handle a 1GB SODIMM.
FYI the memory is: 200 Pin DDR2-533 PC2-4200 SODIMM
The official upgrade slot is located on the bottom of the laptop and is easy to find. Just unscrew the small cover and there it is.
The other slot requires you to unscrew the two screen bracket screws. Once you have done this, between ESC and F1, F4 and F5 and F12 and PrtSc there are small plastic rings. Put a biro nib into these and pull down. They will pop down. You can now remove the plastic cover. Unscrew the two screws marked "L9" on the bottom of the laptop which are located at the top of the memory cover. Now you can remove the keyboard. Underneath the keyboard is the second RAM slot. The SiS 650 chipset supports a max of 1GB per memory slot and since this laptop has two slots that means 2GB of RAM. I've used Kingston DDR400 PC 3200 SODIMMS.
You can also upgrade the CPU - the fastest CPU available is the Pentium-M 2.6GHz. Nothing faster will work - trust me on this. It must be a Pentium 4 Northwood architecture CPU with a 400MHz FSB. Standard P4 Northwood CPUs with the metal shim won't fit - unless you know a way of removing the shim without destroying the CPU. Best to stick with a Pentium mobile (Pentium 4 M) chip. Look on Ebay for these.
Of course the hard disk can also be upgraded - a 200GB 7200RPM 2.5" drive works a treat. Non SATA of course.
You can add wireless and USB 2.0 using PCMCIA carbus cards. I use a StarTech 54mbps wireless card with the RAlink chipset and a NEC USB 2.0 card with 4 USB ports. Both cards fit in at the same time.
The Crucial website suggests you can put 1GB in each slot.
Sony might know which CPUs will work with this. Hopefully any Pentium-M with 533 FSB.