10 Things Every Windows PC User Should Know
Learn to use your Windows Task Manager
Often when your PC has decided to start working super slowly, or not at all, the problem lies in your open programs using up too much memory or computer processing power. When your PC uses more RAM memory then it has, it starts using virtual memory or paging, essentially trading speed for more memory. Since you probably have many unneeded programs running in the background, its best to shut them down and free up some of that precious memory.
First hit CTRL+Shift+Escape to open the task manager. On the bottom bar of the window you'll see your CPU usage and physical memory usage, and be able to deduce what resources your computer is in need of.
Take a look at your running applications under the applications tab, but what's more interesting is the running processes, which are programs running in the background which you don't necessarily know about. Click the “memory” column to sort the processes by memory consumption, and highlight the one you'd like to remove, then click “End Process”. Remove processes with caution, as some of them are essential for your computer to run properly. If you don't know what a process does, DO NOT remove it.