Sometimes, as with most Windows applications, you may find that your TOAD installation needs to be refreshed or removed and replaced. However, before you lay the blame on TOAD, make sure that your database connectivity is not the real issue. For example, sometimes people install Oracle updates or new tools that modify the Oracle Home setting, which is where the database connectivity information resides. In such a case, TOAD may seem to stop working. Once you're 100% sure it's not a connectivity issue related to something else and, therefore, you know you want to reinstall TOAD, then simply run the TOAD installer and uninstall TOAD.
Furthermore, TOAD creates directories in two key places. First, it places the executables under C:\Program Files\Quest Software\Toad for Oracle. You may decide to manually delete these files if the installer leaves any remnants. Second, TOAD places your custom files (i.e., those special to your Windows login) under C:\Documents and Settings\%USER%\Application Data\Quest Software\Toad for Oracle.
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