Go to
www.powerleap.com (my choice) or
www.crucial.com. They have a program that you have to download that will scan your PC and tell you how much memory you can add and what kind and sell it to you at a cheap price. All you have to do is look at the user manual for how to install it.
You have to go to task manager to see how much you are using. Alt-Ctrl-Del and go to the Performance tab and look at the Physical memory area. If you are low add what you can afford.
I added 1 meg to my laptop. At the price these two sites charge for memory you cannot go wrong.
Memory only helps the apps on the PC. If you are experiencing slow uploads and downloads it might be something else.