From Uniblue:

Clean, repair, and optimize your system with the leading and award-winning Registry Booster from Uniblue.Residual files, unused and undeleted drivers, and corrupt or bad entries in registry settings will quickly litter even the newest of computers. Registry Booster is the safest and most trusted solution to clean and optimize your system, free it from registry errors and fragmented entries.Through Advanced Error Detection Technology, Registry Booster automatically identifies missing, corrupt, or invalid items in your Windows registry and dramatically enhances performance and general stability.