The Windows Registry is a crucial part of your PC's operation system. Problems with the Windows Registry are a common cause of Windows crashes, glitches, conflicts, and error messages. Registry problems can occur for many reasons, including references left behind after uninstallation; incorrect removal of software; missing or corrupt hardware drivers; or orphaned start-up programs. This will significantly increase the Registry size and slow down your computer, because Windows will need more time to load, search, and read data from the Registry.