Rainmeter is a customizable performance meter, which can display the CPU load, memory utilization, disk space, network traffic, time and many more things...
Download link:
http://rainmeter.googlecode.com/files/Rainmeter-1.2-r416-32bit-beta.exe
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Download link:
http://rainmeter.googlecode.com/files/Rainmeter-1.2-r416-32bit-beta.exe