Delete Unnecessary file

For use Windows Operating system create a lot of event file. In the reason  of This file  storage , as a result computer  speed  slow. For erase this type file, mouse click on right button above of  My computer, then click Manage option. Now Select System Tools/Event Viewer/Application  option. You notice that right side many  event file shown here.  For erase this file select on menu bar then action/clear all Events. Now direct delete all file click on "No". If you click on "Yes" all file makes back up. Same way  go to System tools/Event Viewer/Application then delete system and Security files.