All configuration information related to current user, operating system, hardware, and software is contained in these five keys. If you want have a look at the registry, then run the Regedit command from Start - Run to open the Registry Editor window. You will see a Windows Explorer like structure. By default, the left pane of the Registry Editor displays the five root keys. You can expand these root keys to view subkeys. When you select subkeys, their values are displayed in the right pane of the Registry Editor window.
Registry problems occur due to the accumulation of a large number of unwanted, outdated, redundant, and invalid information in the registry. Given below are some of the activities that leave behind these entries in the registry. What happens due to registry problems?