Almost every software and application uses some amount of your hard disk space to store its temporary data. As you use your computer, it gets heavier by the day with these small files. Even though they are not used frequently by their respective programs, but they continue to be stored and take up your disk space. Remove the junk files from your computer manually as these files may be stored in different locations on your hard drive. Take help from Windows built in applications to clean up these files. Follow this step by step guide to learn how to delete junk files in Windows 7 using ‘Disk Cleanup Tool’.