SIW(System Information for Windows) can gather extensive information about your system properties. It can displays information about Operating System,Processes, Services, System uptime, Installed Programs, Product Key and so on. And also the software is free.
Now it's a great news that SIW v2009-10-22 compatibled with Windows 7.
What is the Changelog for SIW v2009-10-22:
Windows 7 Compatible
DirectX detection on Windows 7
Correct Splash Screen size if DPI != 96
Scheduled Tasks for Vista and Windows 7
Tools --> Hibernate Enable/Disable for Windows 7
Fixed: CPU and Memory Usage
Download SIW for free