Many Windows based computers come with Snipping Tool, which is pretty handy for capturing parts of any screen. Whatever you capture goes immediately to your clipboard, from which you can paste into the Paint program or a rich text document, type in notes to yourself that include information about whose work it was and the url where you found it.
If you are careful to include memorable keywords (in a document - not an image file), it means that you should be able to pull it up quickly from your computer by using the search function. It sure beats any paper filing system.