A+: Adjusting Processes
The Windows Task Manager’s Processes tab lists processes currently taking place by the name of the executable file. To adjust the priority for a particular process from the default (Normal) to a higher or lower priority, right-click the process, select Set Priority, and choose a priority from the listing
Be careful when setting custom priorities for processes. If you want to tweak application priority, make the change just one step at a time. Going to a high priority for one application could make other applications less responsive or could cause the operating system to freeze up. Also, changing the priority of SYSTEM processes isn’t recommended. Doing so could make your system unresponsive.
If you don’t like the changes, reboot the system. Priority changes last only for the current computing session.