This is the reason: in fact, this is because we use too much software and files, we use the computer often will not delete the files, and deleted the system files and software fragments will occupy the computer's memory.
To use the Disk Defragmenter tutorial:
1. First use the mouse to click "Start"--"All Programs"--"accessories"--"System Tools" and click "Disk Defragmenter." As shown in the following illustration:
2. In the Disk Defragmenter dialog box, select the letter you want to defragment, and then click the Analyze button, as shown in the following illustration:
3. Then the system will carry out disk fragmentation analysis, when the finishing will display a different color, we can see the meaning below, we just click the "Defragmentation" button can be, as shown in the following figure:
Using the system's own disk defragmentation we will have a clear feeling not only the boot speed will be faster and the system is running faster and smoother, if you think the system with this tool is not good to use it may wish to download professional processing software online.