For most of computer users, they may know how to start up and shut up the computer system, open the application and making use of the Internet to do their own things, but these are just the basics of the computer, beside the common use of the computer, you should be cautious to the system maintainance too. Because with the frequent use of the computer, the computer running speed will become slower and slower, in this situation, you will need to perform a check and optimization of your Windows system, especially the registry clean.