its telling you that your physical memory (RAM) is used at its full capacity... so the computer has to go to its page file (or virtual memory)... theres no point into increasing your page file size because youll end up running into this probably once again... virutal memory/page file is a selected space thats located on your hard drive that temporarily stores data while it awaits processing
i recommend poping the side out and telling us what speed of memory it says on the memory stick so that we can direct you to some site that sells that.