Speed Up Windows 8 - Optimize Your PC With 4 Way Clear up your hard disk Your computer must accumulate a massive amount of temporary files. They will take up of your hard disk space and slow down your PC. To remove these files, you can run Windows Disk Cleanup utility to clear your PC of these temporary files. Disk Cleanup removes temporary files, empties the Recycle Bin, and removes different kinds of system files and other items that you no longer need. Defragment your hard disk Fragmentation will make your computer run sluggishly because your hard disk has to go through all these fragmented files to piece the correct parts together again. You can use Disk Defragmenter, a utility of Windows, to deal with this situation, making your disks and drives work efficiently. Disk Defragmenter runs on a schedule, but you can also defragment your hard disk manually. Follow the steps below and you can make it. Click theStart button and open Disk Defragmenter. Type Disk Defragmenter in the search box and then click Disk Defragmenter in the list of results. Choose the disk you want to defragment underCurrent status. If you are not sure that whether the disk needs to be defragmented, click Analyze disk. When the Windows is finished analyzing, the Last Run column will show you the percentage of fragmentation on the disk. You'd better defragment the disk if the number is over 10%. Click Defragment disk .If you're prompted for an administrator password or confirmation, type the password or provide confirmation.