OTL by OldTimer is a flexible, multipurpose, diagnostic, and malware removal tool. It's useful for identifying changes made to a system by spyware, malware and other unwanted programs. It creates detailed reports of registry and file settings, and also includes advanced tools and scripting ability for manual removing malware.

For scanning and live protection consider downloading Malwarebytes.

OTL does not make any determination whether an entry is good or bad. For help diagnosing the logs generated, view the tutorial, or ask for free assistance.

Sometimes malware will block OTL.exe by name, or all executables. In that case try one of these alternatives.
OTL.com: http://oldtimer.geekstogo.com/OTL.com
OTL.scr: http://oldtimer.geekstogo.com/OTL.scr