A leading cause of such registry errors is uninstalling of programs. Depending on the programs being uninstalled, one cannot always be certain that associated registry entries are deleted appropriately in the uninstall process. To prevent the need to retroactively clean or repair the registry, as a rule it is best to remove programs using the uninstall option in the host system control panel. However this method is not always available, and other times it is not flawless. At times the program one wants to uninstall is not found in the programs list access from the control panel, resulting in the need for manual uninstall; other times the values are not completely removed from registry—in both cases the need arises for one to fix registry errors directly.
This is commonly done in one of two ways: First of which is to download and use a registry repair program, whether freeware or licensed. The second way is to employ a Tech Support service, such as Fix My Compute Dude or a comparable service, which accesses your computer online and securely to manually diagnose and resolve any and all registry errors.