One of the best-kept secrets at Microsoft is its collection of Windows Sysinternals tools. On the main page, you’ll find tabs for disk, networking, process, and security utilities. Within each category are free programs designed to keep your machine safe and efficient.
 

Process Explorer

Process Explorer, the number-one download, shows what’s running on your laptop.
 

AutoRuns

AutoRuns shows which programs start up automatically each time you press the Power button.
 

RootkitRevealer

RootkitRevealer, a security utility, detects stealthy root-kit programs, which rob users of administrative rights.


BlueScreen Screen Saver

Hilariously, the BlueScreen screen saver is designed to deter thieves and busybodies by mimicking the “Blue Screen of Death,” which appears when your computer has suffered from a serious error.