Applications usually scatter their configuration settings all over the Windows registry when they are installed, but in general there are two places you can find these settings in case you want to modify them or troubleshoot something. Specifically, per-user application settings are usually found in the following key or something like it:

HKCU\Software\Company\Program\Version\

and per-computer application settings are generally found at:

HKLM\Software\Company\Program\Version\

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Mitch Tulloch is President of MTIT Enterprises, an IT content development company based in Winnipeg, Canada. Prior to starting his own company in 1998, Mitch worked as a Microsoft Certified Trainer (MCT) for Productivity Point International. Mitch is a widely recognized expert on Windows administration, networking and security and has written 14 books and over a hundred articles on various topics. He has been repeatedly awarded Most Valuable Professional (MVP) status by Microsoft for his outstanding contributions in supporting users who deploy Microsoft platforms, products and solutions. Mitch is also a professor at Jones International University (JIU) where he teaches graduate-level courses in Information Security Management (ISM) for their Masters of Business Administration (MBA) program. For more information see http://www.mtit.com.