1.Right click on the start bar and click start task manager.
2.Click the Performance tab.
3.Click on the bar named memory to sort the applications by how much memory they are using.
4.Now end Process on any software you’re not using right now.
5.(Optional) Refer to this post to stop the software from starting with your computer. Stop startup programs.
Edit: Sorry forgot a step this is to clear up some confusion.
6. You will be prompted with a warning box. If you are closing word or some other app make sure everything is saved first. And closing an applictation that you don’t know could cause the system to be unstable but after a restart everything will go back to normal so you don’t really need to worry.