The Windows Sysinternals Suite is a set of advanced tools for troubleshooting issues with Windows-based computers. These tools were originally developed by Winternals Software LP, a company that Microsoft acquired in 2006. Winternals was established in 1996 by Mark Russinovich and Bryce Cogswell, recognized industry leaders in operating system design and architecture. Examples of some useful tools in this suite include the following:

The entire Sysinternals Suite can be downloaded as a compressed archive file from
http://download.sysinternals.com/Files/SysinternalsSuite.zip

Once you download the Zip file extract all files and save under new folder as shown below

You can double click any suite of your choice and start troubleshooting your problem.

 Below are the screenshot and short description of some of the above mentioned suite.

Autoruns: This tool lets you see what programs are configured to start up automatically when your system boots. It also displays the full list of registry and file locations where applications can configure autostart settings.

 TCPView: This tool lets you view active sockets on the computer in real time.

ShellRunas: This tool allows you to launch programs as a different user using a shell context-menu entry.

BgInfo: This tool automatically generates desktop backgrounds that include important information about the system, including IP addresses, computer name, network adapters, and more.

RootkitRevealer: This tool lets you scan your system for rootkit-based malware.

For more information visit : http://technet.microsoft.com/en-us/sysinternals/default.aspx