I. Clean the disk and defragment the disk. ...
1. In "My Computer" window, right-click on the drive you want to clean - "Properties" - "Disk Cleanup" - check the files you want to delete - OK - Yes.
2. Clear temporary files: Start - Run - input %temp% - OK.
3. Use optimization tools such as "Optimize Master" or "Super Rabbit" to clean the registry and junk files.