Welcome to the forum.
Along with Harm's link, with a list of necessary questions, this ARTICLE might help with the Low Memory messages. Remember "memory," and "resources" are often both physical RAM and also Windows Virtual Memory (Page File). Likely that you have many unnecessary programs and Processes running. Get rid of them and things should get better, if not be fixed.
Good luck, and we'll be looking for the answers in Harm's link.