That's it. It should tell you how many slots you have and what memory you have in those slots, and it also tells you what kind of memory you can use and how much. Yes, they sell memory, but you do not have to buy from them. I have bought Crucial memory, and it is very good, but you might be able to find the same kind cheaper somewhere else, even at a local store on sale. But this does give you the information you need in order to purchase more memory.

Any computer can be considered unworthy by someone, because a lot of it is nebulous and personal taste. For example, for my previous computer purchase, I bought a cheapie laptop because I had all the bells and whistles I needed at work so the last thing I wanted to do at home was use a computer. So I just bought something for e-mail and online shopping at home. THEN, I lost my job. Now I work from home a ton, and my DVD player that was attached to my TV went out and I can't afford a new one so I am using my laptop for watching movies, which I also do a ton more since I replaced expensive cable that I didn't care much for with Netflix. I use this as an example because even though you maybe bought a little more than you think you need, you never know where your life will take your or where technology will take us in the future. I know I paid 100 dollars more for getting a new Sony laptop, with the sole reason being I didn't have to struggle with the keyboard the way I did with all the other ones I tried, and I know I will be typing a ton in graduate school. So I have some remores at paying 100 more for a computer that is not that much better than the cheaper ones, but I KNOW I will be thanking myself later when I am knee deep in my doctoral disseration and am spending hours on it. It's very hard to know how to parcel out financial priorities in these difficult times, and THAT I DO think is worth discussing on a forum. I say, if you CAN, pay a little more to get a little more which will stand you in good stead for the future. But other people will say, get the minimum and live with it. Neither school is right or wrong. But once you have decided, own your decision and don't look back, IMHO. Because you are just going to get conflicting advice from the two camps til the cows come home. If you made what YOU thought was a good decision, stand by it. . . . Of course that is just my opinion, lol!

Probably a pentium 400 cpu so just a guess, could be old PC-100 or PC-133 Sdram. $15 - $25 for a new stick of 128mb or 256mb. Could be your local computer shop would have a pair of used 128mb sticks they might want $5 each for. Not much use for the older style memory now-adays. Some computers need the memory modules installed in pairs, some don't care if you just put one stick, or an even or odd number of sticks into it. Some motherboards have One, Two, Three, or Four slots to plug in memory. Some really old ones might have eight slots. Usually just either replace whats installed with larger MB's, or add a new memory stick or two. You'll have to look at the motherboard to see how many memory slots there are and what's installed now. You can get a good idea what is there at the below link but the results aren't always 100% accurate. You need to look see what's physically installed before making a purchase decision. Sometimes the memory scans might show 2 sticks installed yet there is only one, is the most often snafu. Memory for the most part just plugs in and out with usually a plastic or metal spring clip on one or both ends to hold it down. You need to be careful about body static killing them... I usually just barefoot it when working inside a computer case and lean a toe or arm on the case to make sure my body and the case has the same ground potentials. Here is a link that might be useful: Crucial Memory Scan

It sounds more like you need to free up some space on your hard drive. 512 megs of memory is adequate for any image editing application. I work a lot with pictures because it is my business, so I'm normally working with anywhere between 25 and 75 pics at a time tasking between the scanner, PhotoShop, Paint Shop Pro, Photo Paint, and a couple other programs at the same time. That also includes making photo videos (not motion picture videos). 512 was plenty for me when running 98 and XP. I upgraded for the sake of motion picture videos. Years of working with pictures did not force me into it. Whenever I get those error messages, I know it's time to check hard disk space, and invariably I am quite low. Also don't forget to check the Windows Temp directory, which accumulates lots of useless tmp files, and the Recycle Bin. I often forget and leave stuff in there. To answer your questions: Yes, there are different kinds. Either your order (purchase) form will tell you or the book on your motherboard will tell you what kind of memory you need. Or, pop a/the chip out of its well and take it to the store with you. They can look at it and tell you. To pop it out, you're looking for a card about 1 inch deep and about 4 inches wide. It is held in place with a white clip on one end. Pop the clip. Ideally, you want a gig of memory since you're upgrading anyway. More if you want and your motherboard can accommodate. You might find one chip (a 512 chip) or two chips (2-256 chips), but I doubt there would be more than two there. Note how many wells you have and whether they are the same color so you can figure out how to maximize your purchase, of course depending on how much you're willing to spend.