CheckOutXP is a simple performance monitor that runs in the system tray and alerts you of conditions that can cause your computer to slow down. It monitors memory, CPU, disk and network conditions and changes the tray icon color when they reach a critical value. An very basic application, aimed at novice users, with a rather high price tag.

The license of this software is Free Trial Software, the price is $39.95, you can free download and get a free trial.