We're not sure yet if cwdefscn.exe and CWDefScan are adware, a virus, or some other type of harmful program. Has cwdefscn.exe been found or your hard drive? If you know what this file does, please post a comment with what you know.

You may have a adware or a form of virus on your hard drive, and be completely unaware.

Scanning your hard drive for free is the best way to avoid major problems in the future.