I don't think that selecting all the application and end task them will increase the speed because on the other hand if you see the Processes section then you note that some application are running. But at the front end there are not running. That means those application are taking the memory allocation in CPU. So, try to end task them.
But there will be a application running called SVchost.exe,explorer.exe, system, system idle process, smss.exe, winlogon, services.exe. Just don't end task these exe's otherwise your system will shutdown.
Thanks & Regards,