The Windows registry is a place where all startup and functioning information is stored in the system as well as the applications. Registry errors can be caused by improperly uninstalled applications that leave registry entries that cause start-up problems. Viruses, Trojans, spyware, malware are also known to cause registry errors because they install registry entries that are very difficult to remove manually. There is a very big chance that your computer’s problems such as runtime errors are caused by registry errors. They also change file associations and prevent you from opening executable files. Registry errors are also caused by a vast number of unnecessary files on your computer system.
Registry errors cause the overall system to slow down. Because the registry is the central configuration center for programs and system components, any errors cause slow start-up and shutdowns. Registry errors cause applications to slow down, freeze and eventually crash. Registry errors also are known to cause network errors, especially if there are malware entries that create network intrusions.
Properly uninstall programs and applications you do not use. While most programs can be uninstalled from the Add or Remove Programs (#) window on the Control Panel others must be uninstalled using a removal tool supplied by your software’s manufacturer. Run frequent virus scans, and delete malicious files that install on the registry and cause programs to crash. Fix registry errors with registry cleaning tools.
Research the options available to you, read the reviews of users and look at the ratings of the various professionals in order to find the best registry cleaner for your computer.
Never download programs, games (http://www.ehow.com/hobbies-games/) or applications from malicious websites such as Warez. Most of the downloads are bundled together with Trojan viruses that install entries in the registry.
IF you are not a professional, never try to manually fix registry errors because you are likely to seriously damage your computer’s functioning.
Always back up the registry so you have a restore point you can come back to in case of system errors or a system crash.