How to Add the CPU Meter Gadget to the Windows Vista Sidebar

You can track how much memory and CPU your computer is using by adding the CPU Meter tool to the sidebar in Windows Vista. The CPU is just a reminder that helps you monitor the performance of your computer. This tool can definitely come in handy to show you when you need to free up some space.
Add the CPU Meter tool to the sidebar.
When you add a CPU Meter widget to the sidebar, you can find and view gadget information more quickly and easily. Simply click the tools icon (the plus sign) at the top of the sidebar to open the tools gallery. Then click and drag the CPU Meter gadget to the sidebar.

Use the readings to monitor CPU and memory usage.
You can monitor the following things:
CPU usage monitors how hard your CPU is working to process the different programs and processes running on your computer.

Random Access Memory (RAM) monitors the percentage of your computer’s memory in use.
You cannot make or change any settings that you track with this tool. It is just a small tool that helps you to monitor the performance of your computer. If the memory is almost 100%, consider freeing up some space. If your CPU is in a higher percentage, you likely have a lot of programs running which can slow down your computer’s performance; Consider closing some!
If you want more details about your computer’s memory usage, use the Start menu to display the Control Panel and choose System and Maintenance. System bindings allow you to monitor the processor speed and the amount of available RAM.