BleepingComputer Review:

OTL, or OldTimer ListIt, is a tool that is used to diagnose a computer for a possible malware presence and to provide system diagnostics information that can by someone working on a computer.  When run, OTL will scan your computer for a variety of information and then generate a report with a tremendous amount of information about your computer's hardware, programs, files, and running environment.

Usage Instructions:

1. Download OTL from the download button above and save it to your desktop.
2. Double-click on the OTL button and you will be presented with settings screen.
3. Select any options you wish to scan with, and click on the Run Scan button.
4. When OTL has finished gathering information it will display a notepad showing the contents of the OTL.txt log file.  The program will also have created a file called Extras.txt on your desktop that contains further information.l

For more information on how to use OTL, please see this guide.