That config is good enough. Is the antivirus up to date? Also, turn on the Windows Firewall, will protect you from many threats.
Hope not many background activities are running. Do one thing, open Nest Trader, log on to get to market watch. Then let it be idle. Close all other tabs on Chrome. Close any other applications you are aware off. Check applications in the task manager next to where the time is displayed and close them. Now open Windows Task Manager and go to Processes tab. Here you will see the list of processes running. How much 'mem usage' does NestTrader.exe take up? And how much CPU usage? Both, in idle environment. Also, in this list you can investigate what undesired programs are running and you can eliminate them. Be sure what program you kill from here, as some programs are important for Windows to function properly. Do not kill any program whose owner is 'System'.
Btw, NestTrader.exe is using 217,000K mem usage and 0% CPU in idle, running 3 market watch with a total of 10 scrips in non trading hrs. This information is frm my system for your reference only.